diff --git a/include/haproxy/cfgparse.h b/include/haproxy/cfgparse.h
index 186ecf75b..62973d818 100644
--- a/include/haproxy/cfgparse.h
+++ b/include/haproxy/cfgparse.h
@@ -47,7 +47,7 @@ struct cfg_keyword {
 		     char **args,               /* command line and arguments */
 		     int section_type,          /* current section CFG_{GLOBAL|LISTEN} */
 		     struct proxy *curpx,       /* current proxy (NULL in GLOBAL) */
-		     struct proxy *defpx,       /* default proxy (NULL in GLOBAL) */
+		     const struct proxy *defpx, /* default proxy (NULL in GLOBAL) */
 		     const char *file,          /* config file name */
 		     int line,                  /* config file line number */
 		     char **err);               /* error or warning message output pointer */
diff --git a/include/haproxy/stream.h b/include/haproxy/stream.h
index aa6486e25..f558a1fa4 100644
--- a/include/haproxy/stream.h
+++ b/include/haproxy/stream.h
@@ -72,10 +72,6 @@ void stream_process_counters(struct stream *s);
 void sess_change_server(struct stream *sess, struct server *newsrv);
 struct task *process_stream(struct task *t, void *context, unsigned int state);
 void default_srv_error(struct stream *s, struct stream_interface *si);
-int parse_track_counters(char **args, int *arg,
-			 int section_type, struct proxy *curpx,
-			 struct track_ctr_prm *prm,
-			 struct proxy *defpx, char **err);
 
 /* Update the stream's backend and server time stats */
 void stream_update_time_stats(struct stream *s);
diff --git a/src/51d.c b/src/51d.c
index 6cd1d28aa..2c52c597c 100644
--- a/src/51d.c
+++ b/src/51d.c
@@ -57,7 +57,7 @@ static struct {
 };
 
 static int _51d_data_file(char **args, int section_type, struct proxy *curpx,
-                          struct proxy *defpx, const char *file, int line,
+                          const struct proxy *defpx, const char *file, int line,
                           char **err)
 {
 	if (*(args[1]) == 0) {
@@ -75,7 +75,7 @@ static int _51d_data_file(char **args, int section_type, struct proxy *curpx,
 }
 
 static int _51d_property_name_list(char **args, int section_type, struct proxy *curpx,
-                                   struct proxy *defpx, const char *file, int line,
+                                   const struct proxy *defpx, const char *file, int line,
                                    char **err)
 {
 	int cur_arg = 1;
@@ -99,7 +99,7 @@ static int _51d_property_name_list(char **args, int section_type, struct proxy *
 }
 
 static int _51d_property_separator(char **args, int section_type, struct proxy *curpx,
-                                   struct proxy *defpx, const char *file, int line,
+                                   const struct proxy *defpx, const char *file, int line,
                                    char **err)
 {
 	if (*(args[1]) == 0) {
@@ -121,7 +121,7 @@ static int _51d_property_separator(char **args, int section_type, struct proxy *
 }
 
 static int _51d_cache_size(char **args, int section_type, struct proxy *curpx,
-                           struct proxy *defpx, const char *file, int line,
+                           const struct proxy *defpx, const char *file, int line,
                            char **err)
 {
 	if (*(args[1]) == 0) {
diff --git a/src/activity.c b/src/activity.c
index 0d945ac96..764613ffc 100644
--- a/src/activity.c
+++ b/src/activity.c
@@ -42,7 +42,7 @@ void report_stolen_time(uint64_t stolen)
 
 /* config parser for global "profiling.tasks", accepts "on" or "off" */
 static int cfg_parse_prof_tasks(char **args, int section_type, struct proxy *curpx,
-                                struct proxy *defpx, const char *file, int line,
+                                const struct proxy *defpx, const char *file, int line,
                                 char **err)
 {
 	if (too_many_args(1, args, err, NULL))
diff --git a/src/cfgparse-ssl.c b/src/cfgparse-ssl.c
index 6af1328f6..9ac3702e4 100644
--- a/src/cfgparse-ssl.c
+++ b/src/cfgparse-ssl.c
@@ -42,7 +42,7 @@
 /****************** Global Section Parsing ********************************************/
 
 static int ssl_load_global_issuers_from_path(char **args, int section_type, struct proxy *curpx,
-					      struct proxy *defpx, const char *file, int line,
+					      const struct proxy *defpx, const char *file, int line,
 					      char **err)
 {
 	char *path;
@@ -121,7 +121,7 @@ static int ssl_load_global_issuers_from_path(char **args, int section_type, stru
  * Returns <0 on alert, >0 on warning, 0 on success.
  */
 static int ssl_parse_global_ssl_async(char **args, int section_type, struct proxy *curpx,
-                                       struct proxy *defpx, const char *file, int line,
+                                       const struct proxy *defpx, const char *file, int line,
                                        char **err)
 {
 #ifdef SSL_MODE_ASYNC
@@ -139,7 +139,7 @@ static int ssl_parse_global_ssl_async(char **args, int section_type, struct prox
  * Returns <0 on alert, >0 on warning, 0 on success.
  */
 static int ssl_parse_global_ssl_engine(char **args, int section_type, struct proxy *curpx,
-                                       struct proxy *defpx, const char *file, int line,
+                                       const struct proxy *defpx, const char *file, int line,
                                        char **err)
 {
 	char *algo;
@@ -182,7 +182,7 @@ add_engine:
  * in global section. Returns <0 on alert, >0 on warning, 0 on success.
  */
 static int ssl_parse_global_ciphers(char **args, int section_type, struct proxy *curpx,
-                                    struct proxy *defpx, const char *file, int line,
+                                    const struct proxy *defpx, const char *file, int line,
                                     char **err)
 {
 	char **target;
@@ -207,7 +207,7 @@ static int ssl_parse_global_ciphers(char **args, int section_type, struct proxy
  * in global section. Returns <0 on alert, >0 on warning, 0 on success.
  */
 static int ssl_parse_global_ciphersuites(char **args, int section_type, struct proxy *curpx,
-                                    struct proxy *defpx, const char *file, int line,
+                                    const struct proxy *defpx, const char *file, int line,
                                     char **err)
 {
 	char **target;
@@ -234,7 +234,7 @@ static int ssl_parse_global_ciphersuites(char **args, int section_type, struct p
  * Returns <0 on alert, >0 on warning, 0 on success.
  */
 static int ssl_parse_global_curves(char **args, int section_type, struct proxy *curpx,
-                                   struct proxy *defpx, const char *file, int line,
+                                   const struct proxy *defpx, const char *file, int line,
 				   char **err)
 {
 	char **target;
@@ -257,7 +257,7 @@ static int ssl_parse_global_curves(char **args, int section_type, struct proxy *
  * Returns <0 on alert, >0 on warning, 0 on success.
  */
 static int ssl_parse_global_int(char **args, int section_type, struct proxy *curpx,
-                                struct proxy *defpx, const char *file, int line,
+                                const struct proxy *defpx, const char *file, int line,
                                 char **err)
 {
 	int *target;
@@ -294,7 +294,7 @@ static int ssl_parse_global_int(char **args, int section_type, struct proxy *cur
 }
 
 static int ssl_parse_global_capture_cipherlist(char **args, int section_type, struct proxy *curpx,
-                                               struct proxy *defpx, const char *file, int line,
+                                               const struct proxy *defpx, const char *file, int line,
                                                char **err)
 {
 	int ret;
@@ -319,7 +319,7 @@ static int ssl_parse_global_capture_cipherlist(char **args, int section_type, st
 /* init the SSLKEYLOGFILE pool */
 #ifdef HAVE_OPENSSL_KEYLOG
 static int ssl_parse_global_keylog(char **args, int section_type, struct proxy *curpx,
-                                       struct proxy *defpx, const char *file, int line,
+                                       const struct proxy *defpx, const char *file, int line,
                                        char **err)
 {
 
@@ -358,7 +358,7 @@ static int ssl_parse_global_keylog(char **args, int section_type, struct proxy *
  * Returns <0 on alert, >0 on warning, 0 on success.
  */
 static int ssl_parse_global_private_cache(char **args, int section_type, struct proxy *curpx,
-                                          struct proxy *defpx, const char *file, int line,
+                                          const struct proxy *defpx, const char *file, int line,
                                           char **err)
 {
 	if (too_many_args(0, args, err, NULL))
@@ -372,7 +372,7 @@ static int ssl_parse_global_private_cache(char **args, int section_type, struct
  * Returns <0 on alert, >0 on warning, 0 on success.
  */
 static int ssl_parse_global_lifetime(char **args, int section_type, struct proxy *curpx,
-                                     struct proxy *defpx, const char *file, int line,
+                                     const struct proxy *defpx, const char *file, int line,
                                      char **err)
 {
 	const char *res;
@@ -408,7 +408,7 @@ static int ssl_parse_global_lifetime(char **args, int section_type, struct proxy
  * Returns <0 on alert, >0 on warning, 0 on success.
  */
 static int ssl_parse_global_dh_param_file(char **args, int section_type, struct proxy *curpx,
-                                       struct proxy *defpx, const char *file, int line,
+                                       const struct proxy *defpx, const char *file, int line,
                                        char **err)
 {
 	if (too_many_args(1, args, err, NULL))
@@ -430,7 +430,7 @@ static int ssl_parse_global_dh_param_file(char **args, int section_type, struct
  * Returns <0 on alert, >0 on warning, 0 on success.
  */
 static int ssl_parse_global_default_dh(char **args, int section_type, struct proxy *curpx,
-                                       struct proxy *defpx, const char *file, int line,
+                                       const struct proxy *defpx, const char *file, int line,
                                        char **err)
 {
 	if (too_many_args(1, args, err, NULL))
@@ -456,7 +456,7 @@ static int ssl_parse_global_default_dh(char **args, int section_type, struct pro
  * multiple arguments are allowed: "bundle", "sctl", "ocsp", "issuer", "all", "none"
  */
 static int ssl_parse_global_extra_files(char **args, int section_type, struct proxy *curpx,
-                                       struct proxy *defpx, const char *file, int line,
+                                       const struct proxy *defpx, const char *file, int line,
                                        char **err)
 {
 	int i;
@@ -519,7 +519,7 @@ err_arg:
 
 /* parse 'ssl-load-extra-del-ext */
 static int ssl_parse_global_extra_noext(char **args, int section_type, struct proxy *curpx,
-                                       struct proxy *defpx, const char *file, int line,
+                                       const struct proxy *defpx, const char *file, int line,
                                        char **err)
 {
 	global_ssl.extra_files_noext = 1;
@@ -1619,7 +1619,7 @@ static int srv_parse_verifyhost(char **args, int *cur_arg, struct proxy *px, str
 
 /* parse the "ssl-default-bind-options" keyword in global section */
 static int ssl_parse_default_bind_options(char **args, int section_type, struct proxy *curpx,
-                                          struct proxy *defpx, const char *file, int line,
+                                          const struct proxy *defpx, const char *file, int line,
                                           char **err) {
 	int i = 1;
 
@@ -1651,7 +1651,7 @@ static int ssl_parse_default_bind_options(char **args, int section_type, struct
 
 /* parse the "ssl-default-server-options" keyword in global section */
 static int ssl_parse_default_server_options(char **args, int section_type, struct proxy *curpx,
-                                            struct proxy *defpx, const char *file, int line,
+                                            const struct proxy *defpx, const char *file, int line,
                                             char **err) {
 	int i = 1;
 
@@ -1683,7 +1683,7 @@ static int ssl_parse_default_server_options(char **args, int section_type, struc
  * Returns <0 on alert, >0 on warning, 0 on success.
  */
 static int ssl_parse_global_ca_crt_base(char **args, int section_type, struct proxy *curpx,
-                                        struct proxy *defpx, const char *file, int line,
+                                        const struct proxy *defpx, const char *file, int line,
                                         char **err)
 {
 	char **target;
@@ -1708,7 +1708,7 @@ static int ssl_parse_global_ca_crt_base(char **args, int section_type, struct pr
 
 /* parse the "ssl-skip-self-issued-ca" keyword in global section.  */
 static int ssl_parse_skip_self_issued_ca(char **args, int section_type, struct proxy *curpx,
-					 struct proxy *defpx, const char *file, int line,
+					 const struct proxy *defpx, const char *file, int line,
 					 char **err)
 {
 #ifdef SSL_CTX_build_cert_chain
diff --git a/src/cli.c b/src/cli.c
index f48795a42..72919ce32 100644
--- a/src/cli.c
+++ b/src/cli.c
@@ -257,7 +257,7 @@ static struct proxy *alloc_stats_fe(const char *name, const char *file, int line
  * the first word after "stats".
  */
 static int stats_parse_global(char **args, int section_type, struct proxy *curpx,
-                              struct proxy *defpx, const char *file, int line,
+                              const struct proxy *defpx, const char *file, int line,
                               char **err)
 {
 	struct bind_conf *bind_conf;
diff --git a/src/connection.c b/src/connection.c
index b1d643b9d..ac098d371 100644
--- a/src/connection.c
+++ b/src/connection.c
@@ -1298,7 +1298,7 @@ int make_proxy_line_v2(char *buf, int buf_len, struct server *srv, struct connec
 
 /* returns 0 on success */
 static int cfg_parse_pp2_never_send_local(char **args, int section_type, struct proxy *curpx,
-                                          struct proxy *defpx, const char *file, int line,
+                                          const struct proxy *defpx, const char *file, int line,
                                           char **err)
 {
 	if (too_many_args(0, args, err, NULL))
diff --git a/src/da.c b/src/da.c
index c11e0766e..418909226 100644
--- a/src/da.c
+++ b/src/da.c
@@ -35,7 +35,7 @@ static struct {
 };
 
 static int da_json_file(char **args, int section_type, struct proxy *curpx,
-                        struct proxy *defpx, const char *file, int line,
+                        const struct proxy *defpx, const char *file, int line,
                         char **err)
 {
 	if (*(args[1]) == 0) {
@@ -47,7 +47,7 @@ static int da_json_file(char **args, int section_type, struct proxy *curpx,
 }
 
 static int da_log_level(char **args, int section_type, struct proxy *curpx,
-                        struct proxy *defpx, const char *file, int line,
+                        const struct proxy *defpx, const char *file, int line,
                         char **err)
 {
 	int loglevel;
@@ -67,7 +67,7 @@ static int da_log_level(char **args, int section_type, struct proxy *curpx,
 }
 
 static int da_property_separator(char **args, int section_type, struct proxy *curpx,
-                                 struct proxy *defpx, const char *file, int line,
+                                 const struct proxy *defpx, const char *file, int line,
                                  char **err)
 {
 	if (*(args[1]) == 0) {
@@ -79,7 +79,7 @@ static int da_property_separator(char **args, int section_type, struct proxy *cu
 }
 
 static int da_properties_cookie(char **args, int section_type, struct proxy *curpx,
-                          struct proxy *defpx, const char *file, int line,
+                          const struct proxy *defpx, const char *file, int line,
                           char **err)
 {
 	if (*(args[1]) == 0) {
diff --git a/src/extcheck.c b/src/extcheck.c
index 6eaeac1e1..79a63b2a6 100644
--- a/src/extcheck.c
+++ b/src/extcheck.c
@@ -602,7 +602,7 @@ struct task *process_chk_proc(struct task *t, void *context, unsigned int state)
 
 /* Parses the "external-check" proxy keyword */
 int proxy_parse_extcheck(char **args, int section, struct proxy *curpx,
-                         struct proxy *defpx, const char *file, int line,
+                         const struct proxy *defpx, const char *file, int line,
                          char **errmsg)
 {
 	int cur_arg, ret = 0;
diff --git a/src/fcgi-app.c b/src/fcgi-app.c
index 71f6dd48b..4a7e0b358 100644
--- a/src/fcgi-app.c
+++ b/src/fcgi-app.c
@@ -581,7 +581,7 @@ parse_fcgi_flt(char **args, int *cur_arg, struct proxy *px,
 
 /* Parses the "use-fcgi-app" proxy keyword */
 static int proxy_parse_use_fcgi_app(char **args, int section, struct proxy *curpx,
-				    struct proxy *defpx, const char *file, int line,
+				    const struct proxy *defpx, const char *file, int line,
 				    char **err)
 {
 	struct flt_conf *fconf = NULL;
diff --git a/src/fd.c b/src/fd.c
index 5102c9444..292a9e0ea 100644
--- a/src/fd.c
+++ b/src/fd.c
@@ -809,7 +809,7 @@ int fork_poller()
 
 /* config parser for global "tune.fd.edge-triggered", accepts "on" or "off" */
 static int cfg_parse_tune_fd_edge_triggered(char **args, int section_type, struct proxy *curpx,
-                                      struct proxy *defpx, const char *file, int line,
+                                      const struct proxy *defpx, const char *file, int line,
                                       char **err)
 {
 	if (too_many_args(1, args, err, NULL))
diff --git a/src/filters.c b/src/filters.c
index 69ebf525f..a5fc36760 100644
--- a/src/filters.c
+++ b/src/filters.c
@@ -174,7 +174,7 @@ list_filters(FILE *out)
  */
 static int
 parse_filter(char **args, int section_type, struct proxy *curpx,
-	     struct proxy *defpx, const char *file, int line, char **err)
+	     const struct proxy *defpx, const char *file, int line, char **err)
 {
 	struct flt_conf *fconf = NULL;
 
diff --git a/src/flt_http_comp.c b/src/flt_http_comp.c
index b0a2f0bc9..c9ac02112 100644
--- a/src/flt_http_comp.c
+++ b/src/flt_http_comp.c
@@ -619,7 +619,7 @@ struct flt_ops comp_ops = {
 
 static int
 parse_compression_options(char **args, int section, struct proxy *proxy,
-			  struct proxy *defpx, const char *file, int line,
+			  const struct proxy *defpx, const char *file, int line,
 			  char **err)
 {
 	struct comp    *comp;
diff --git a/src/hlua.c b/src/hlua.c
index 12a487267..42d5be2a5 100644
--- a/src/hlua.c
+++ b/src/hlua.c
@@ -8132,7 +8132,7 @@ __LJMP static int hlua_register_cli(lua_State *L)
 }
 
 static int hlua_read_timeout(char **args, int section_type, struct proxy *curpx,
-                             struct proxy *defpx, const char *file, int line,
+                             const struct proxy *defpx, const char *file, int line,
                              char **err, unsigned int *timeout)
 {
 	const char *error;
@@ -8156,7 +8156,7 @@ static int hlua_read_timeout(char **args, int section_type, struct proxy *curpx,
 }
 
 static int hlua_session_timeout(char **args, int section_type, struct proxy *curpx,
-                                struct proxy *defpx, const char *file, int line,
+                                const struct proxy *defpx, const char *file, int line,
                                 char **err)
 {
 	return hlua_read_timeout(args, section_type, curpx, defpx,
@@ -8164,7 +8164,7 @@ static int hlua_session_timeout(char **args, int section_type, struct proxy *cur
 }
 
 static int hlua_task_timeout(char **args, int section_type, struct proxy *curpx,
-                             struct proxy *defpx, const char *file, int line,
+                             const struct proxy *defpx, const char *file, int line,
                              char **err)
 {
 	return hlua_read_timeout(args, section_type, curpx, defpx,
@@ -8172,7 +8172,7 @@ static int hlua_task_timeout(char **args, int section_type, struct proxy *curpx,
 }
 
 static int hlua_applet_timeout(char **args, int section_type, struct proxy *curpx,
-                               struct proxy *defpx, const char *file, int line,
+                               const struct proxy *defpx, const char *file, int line,
                                char **err)
 {
 	return hlua_read_timeout(args, section_type, curpx, defpx,
@@ -8180,7 +8180,7 @@ static int hlua_applet_timeout(char **args, int section_type, struct proxy *curp
 }
 
 static int hlua_forced_yield(char **args, int section_type, struct proxy *curpx,
-                             struct proxy *defpx, const char *file, int line,
+                             const struct proxy *defpx, const char *file, int line,
                              char **err)
 {
 	char *error;
@@ -8194,7 +8194,7 @@ static int hlua_forced_yield(char **args, int section_type, struct proxy *curpx,
 }
 
 static int hlua_parse_maxmem(char **args, int section_type, struct proxy *curpx,
-                             struct proxy *defpx, const char *file, int line,
+                             const struct proxy *defpx, const char *file, int line,
                              char **err)
 {
 	char *error;
@@ -8270,7 +8270,7 @@ static int hlua_load_state(char *filename, lua_State *L, char **err)
 }
 
 static int hlua_load(char **args, int section_type, struct proxy *curpx,
-                     struct proxy *defpx, const char *file, int line,
+                     const struct proxy *defpx, const char *file, int line,
                      char **err)
 {
 	if (*(args[1]) == 0) {
@@ -8285,7 +8285,7 @@ static int hlua_load(char **args, int section_type, struct proxy *curpx,
 }
 
 static int hlua_load_per_thread(char **args, int section_type, struct proxy *curpx,
-                                struct proxy *defpx, const char *file, int line,
+                                const struct proxy *defpx, const char *file, int line,
                                 char **err)
 {
 	int len;
@@ -8345,7 +8345,7 @@ static int hlua_prepend_path(lua_State *L, char *type, char *path)
 }
 
 static int hlua_config_prepend_path(char **args, int section_type, struct proxy *curpx,
-                                    struct proxy *defpx, const char *file, int line,
+                                    const struct proxy *defpx, const char *file, int line,
                                     char **err)
 {
 	char *path;
diff --git a/src/http_htx.c b/src/http_htx.c
index cf536a3fe..1444cf67d 100644
--- a/src/http_htx.c
+++ b/src/http_htx.c
@@ -1721,7 +1721,7 @@ struct http_reply *http_parse_http_reply(const char **args, int *orig_arg, struc
 
 /* Parses the "errorloc[302|303]" proxy keyword */
 static int proxy_parse_errorloc(char **args, int section, struct proxy *curpx,
-				  struct proxy *defpx, const char *file, int line,
+				  const struct proxy *defpx, const char *file, int line,
 				  char **errmsg)
 {
 	struct conf_errors *conf_err;
@@ -1788,7 +1788,7 @@ static int proxy_parse_errorloc(char **args, int section, struct proxy *curpx,
 
 /* Parses the "errorfile" proxy keyword */
 static int proxy_parse_errorfile(char **args, int section, struct proxy *curpx,
-				 struct proxy *defpx, const char *file, int line,
+				 const struct proxy *defpx, const char *file, int line,
 				 char **errmsg)
 {
 	struct conf_errors *conf_err;
@@ -1853,7 +1853,7 @@ static int proxy_parse_errorfile(char **args, int section, struct proxy *curpx,
 
 /* Parses the "errorfiles" proxy keyword */
 static int proxy_parse_errorfiles(char **args, int section, struct proxy *curpx,
-				  struct proxy *defpx, const char *file, int line,
+				  const struct proxy *defpx, const char *file, int line,
 				  char **err)
 {
 	struct conf_errors *conf_err = NULL;
@@ -1916,7 +1916,7 @@ static int proxy_parse_errorfiles(char **args, int section, struct proxy *curpx,
 
 /* Parses the "http-error" proxy keyword */
 static int proxy_parse_http_error(char **args, int section, struct proxy *curpx,
-				  struct proxy *defpx, const char *file, int line,
+				  const struct proxy *defpx, const char *file, int line,
 				  char **errmsg)
 {
 	struct conf_errors *conf_err;
diff --git a/src/listener.c b/src/listener.c
index 8a8ad73a9..4dfaa7f23 100644
--- a/src/listener.c
+++ b/src/listener.c
@@ -1507,7 +1507,7 @@ static int bind_parse_proto(char **args, int cur_arg, struct proxy *px, struct b
 
 /* config parser for global "tune.listener.multi-queue", accepts "on" or "off" */
 static int cfg_parse_tune_listener_mq(char **args, int section_type, struct proxy *curpx,
-                                      struct proxy *defpx, const char *file, int line,
+                                      const struct proxy *defpx, const char *file, int line,
                                       char **err)
 {
 	if (too_many_args(1, args, err, NULL))
diff --git a/src/mux_h1.c b/src/mux_h1.c
index b44de5439..53cbb44fe 100644
--- a/src/mux_h1.c
+++ b/src/mux_h1.c
@@ -3779,7 +3779,7 @@ static int cfg_h1_headers_case_adjust_postparser()
 
 /* config parser for global "h1-outgoing-header-case-adjust" */
 static int cfg_parse_h1_header_case_adjust(char **args, int section_type, struct proxy *curpx,
-					   struct proxy *defpx, const char *file, int line,
+					   const struct proxy *defpx, const char *file, int line,
 					   char **err)
 {
         if (too_many_args(2, args, err, NULL))
@@ -3793,7 +3793,7 @@ static int cfg_parse_h1_header_case_adjust(char **args, int section_type, struct
 
 /* config parser for global "h1-outgoing-headers-case-adjust-file" */
 static int cfg_parse_h1_headers_case_adjust_file(char **args, int section_type, struct proxy *curpx,
-						 struct proxy *defpx, const char *file, int line,
+						 const struct proxy *defpx, const char *file, int line,
 						 char **err)
 {
         if (too_many_args(1, args, err, NULL))
diff --git a/src/mux_h2.c b/src/mux_h2.c
index 20d343a97..e06404273 100644
--- a/src/mux_h2.c
+++ b/src/mux_h2.c
@@ -6588,7 +6588,7 @@ static int h2_takeover(struct connection *conn, int orig_tid)
 
 /* config parser for global "tune.h2.header-table-size" */
 static int h2_parse_header_table_size(char **args, int section_type, struct proxy *curpx,
-                                      struct proxy *defpx, const char *file, int line,
+                                      const struct proxy *defpx, const char *file, int line,
                                       char **err)
 {
 	if (too_many_args(1, args, err, NULL))
@@ -6604,7 +6604,7 @@ static int h2_parse_header_table_size(char **args, int section_type, struct prox
 
 /* config parser for global "tune.h2.initial-window-size" */
 static int h2_parse_initial_window_size(char **args, int section_type, struct proxy *curpx,
-                                        struct proxy *defpx, const char *file, int line,
+                                        const struct proxy *defpx, const char *file, int line,
                                         char **err)
 {
 	if (too_many_args(1, args, err, NULL))
@@ -6620,7 +6620,7 @@ static int h2_parse_initial_window_size(char **args, int section_type, struct pr
 
 /* config parser for global "tune.h2.max-concurrent-streams" */
 static int h2_parse_max_concurrent_streams(char **args, int section_type, struct proxy *curpx,
-                                           struct proxy *defpx, const char *file, int line,
+                                           const struct proxy *defpx, const char *file, int line,
                                            char **err)
 {
 	if (too_many_args(1, args, err, NULL))
@@ -6636,7 +6636,7 @@ static int h2_parse_max_concurrent_streams(char **args, int section_type, struct
 
 /* config parser for global "tune.h2.max-frame-size" */
 static int h2_parse_max_frame_size(char **args, int section_type, struct proxy *curpx,
-                                   struct proxy *defpx, const char *file, int line,
+                                   const struct proxy *defpx, const char *file, int line,
                                    char **err)
 {
 	if (too_many_args(1, args, err, NULL))
diff --git a/src/mworker.c b/src/mworker.c
index 27a1b9f48..afcada6f9 100644
--- a/src/mworker.c
+++ b/src/mworker.c
@@ -558,7 +558,7 @@ static int cli_parse_reload(char **args, char *payload, struct appctx *appctx, v
 
 
 static int mworker_parse_global_max_reloads(char **args, int section_type, struct proxy *curpx,
-           struct proxy *defpx, const char *file, int linenum, char **err)
+           const struct proxy *defpx, const char *file, int linenum, char **err)
 {
 
 	int err_code = 0;
diff --git a/src/proxy.c b/src/proxy.c
index 6d783fd97..a9a49439d 100644
--- a/src/proxy.c
+++ b/src/proxy.c
@@ -198,14 +198,14 @@ int get_backend_server(const char *bk_name, const char *sv_name,
  * "{cli|srv|con}timeout" in args[0].
  */
 static int proxy_parse_timeout(char **args, int section, struct proxy *proxy,
-                               struct proxy *defpx, const char *file, int line,
+                               const struct proxy *defpx, const char *file, int line,
                                char **err)
 {
 	unsigned timeout;
 	int retval, cap;
 	const char *res, *name;
 	int *tv = NULL;
-	int *td = NULL;
+	const int *td = NULL;
 
 	retval = 0;
 
@@ -328,13 +328,13 @@ static int proxy_parse_timeout(char **args, int section, struct proxy *proxy,
  * parsed, and <defpx> to the default proxy or NULL.
  */
 static int proxy_parse_rate_limit(char **args, int section, struct proxy *proxy,
-                                  struct proxy *defpx, const char *file, int line,
+                                  const struct proxy *defpx, const char *file, int line,
                                   char **err)
 {
 	int retval;
 	char *res;
 	unsigned int *tv = NULL;
-	unsigned int *td = NULL;
+	const unsigned int *td = NULL;
 	unsigned int val;
 
 	retval = 0;
@@ -381,7 +381,7 @@ static int proxy_parse_rate_limit(char **args, int section, struct proxy *proxy,
  * the proxy being parsed, and <defpx> to the default proxy or NULL.
  */
 static int proxy_parse_max_ka_queue(char **args, int section, struct proxy *proxy,
-                                    struct proxy *defpx, const char *file, int line,
+                                    const struct proxy *defpx, const char *file, int line,
                                     char **err)
 {
 	int retval;
@@ -420,7 +420,7 @@ static int proxy_parse_max_ka_queue(char **args, int section, struct proxy *prox
  * default proxy or NULL.
  */
 static int proxy_parse_declare(char **args, int section, struct proxy *curpx,
-                               struct proxy *defpx, const char *file, int line,
+                               const struct proxy *defpx, const char *file, int line,
                                char **err)
 {
 	/* Capture keyword wannot be declared in a default proxy. */
@@ -515,7 +515,7 @@ static int proxy_parse_declare(char **args, int section, struct proxy *curpx,
 /* This function parses a "retry-on" statement */
 static int
 proxy_parse_retry_on(char **args, int section, struct proxy *curpx,
-                               struct proxy *defpx, const char *file, int line,
+                               const struct proxy *defpx, const char *file, int line,
                                char **err)
 {
 	int i;
@@ -584,7 +584,7 @@ proxy_parse_retry_on(char **args, int section, struct proxy *curpx,
 #ifdef TCP_KEEPCNT
 /* This function parses "{cli|srv}tcpka-cnt" statements */
 static int proxy_parse_tcpka_cnt(char **args, int section, struct proxy *proxy,
-                                    struct proxy *defpx, const char *file, int line,
+                                    const struct proxy *defpx, const char *file, int line,
                                     char **err)
 {
 	int retval;
@@ -631,7 +631,7 @@ static int proxy_parse_tcpka_cnt(char **args, int section, struct proxy *proxy,
 #ifdef TCP_KEEPIDLE
 /* This function parses "{cli|srv}tcpka-idle" statements */
 static int proxy_parse_tcpka_idle(char **args, int section, struct proxy *proxy,
-                                  struct proxy *defpx, const char *file, int line,
+                                  const struct proxy *defpx, const char *file, int line,
                                   char **err)
 {
 	int retval;
@@ -687,7 +687,7 @@ static int proxy_parse_tcpka_idle(char **args, int section, struct proxy *proxy,
 #ifdef TCP_KEEPINTVL
 /* This function parses "{cli|srv}tcpka-intvl" statements */
 static int proxy_parse_tcpka_intvl(char **args, int section, struct proxy *proxy,
-		                   struct proxy *defpx, const char *file, int line,
+		                   const struct proxy *defpx, const char *file, int line,
                                    char **err)
 {
 	int retval;
@@ -1577,7 +1577,7 @@ struct task *manage_proxy(struct task *t, void *context, unsigned int state)
 
 
 static int proxy_parse_hard_stop_after(char **args, int section_type, struct proxy *curpx,
-                                struct proxy *defpx, const char *file, int line,
+                                const struct proxy *defpx, const char *file, int line,
                                 char **err)
 {
 	const char *res;
diff --git a/src/server.c b/src/server.c
index 04d234779..8eb659d33 100644
--- a/src/server.c
+++ b/src/server.c
@@ -4732,7 +4732,7 @@ remove:
 
 /* config parser for global "tune.idle-pool.shared", accepts "on" or "off" */
 static int cfg_parse_idle_pool_shared(char **args, int section_type, struct proxy *curpx,
-                                      struct proxy *defpx, const char *file, int line,
+                                      const struct proxy *defpx, const char *file, int line,
                                       char **err)
 {
 	if (too_many_args(1, args, err, NULL))
@@ -4751,7 +4751,7 @@ static int cfg_parse_idle_pool_shared(char **args, int section_type, struct prox
 
 /* config parser for global "tune.pool-{low,high}-fd-ratio" */
 static int cfg_parse_pool_fd_ratio(char **args, int section_type, struct proxy *curpx,
-                                   struct proxy *defpx, const char *file, int line,
+                                   const struct proxy *defpx, const char *file, int line,
                                    char **err)
 {
 	int arg = -1;
diff --git a/src/task.c b/src/task.c
index 602c6cef5..8069dda18 100644
--- a/src/task.c
+++ b/src/task.c
@@ -909,7 +909,7 @@ static void init_task()
 
 /* config parser for global "tune.sched.low-latency", accepts "on" or "off" */
 static int cfg_parse_tune_sched_low_latency(char **args, int section_type, struct proxy *curpx,
-                                      struct proxy *defpx, const char *file, int line,
+                                      const struct proxy *defpx, const char *file, int line,
                                       char **err)
 {
 	if (too_many_args(1, args, err, NULL))
diff --git a/src/tcp_rules.c b/src/tcp_rules.c
index c89c2fbcb..da4ce302a 100644
--- a/src/tcp_rules.c
+++ b/src/tcp_rules.c
@@ -568,7 +568,7 @@ int tcp_exec_l5_rules(struct session *sess)
 
 /* Parse a tcp-response rule. Return a negative value in case of failure */
 static int tcp_parse_response_rule(char **args, int arg, int section_type,
-                                   struct proxy *curpx, struct proxy *defpx,
+                                   struct proxy *curpx, const struct proxy *defpx,
                                    struct act_rule *rule, char **err,
                                    unsigned int where,
                                    const char *file, int line)
@@ -731,7 +731,7 @@ static void release_tcp_track_sc(struct act_rule * rule)
 
 /* Parse a tcp-request rule. Return a negative value in case of failure */
 static int tcp_parse_request_rule(char **args, int arg, int section_type,
-                                  struct proxy *curpx, struct proxy *defpx,
+                                  struct proxy *curpx, const struct proxy *defpx,
                                   struct act_rule *rule, char **err,
                                   unsigned int where, const char *file, int line)
 {
@@ -986,7 +986,7 @@ static int tcp_parse_request_rule(char **args, int arg, int section_type,
  * keyword.
  */
 static int tcp_parse_tcp_rep(char **args, int section_type, struct proxy *curpx,
-                             struct proxy *defpx, const char *file, int line,
+                             const struct proxy *defpx, const char *file, int line,
                              char **err)
 {
 	const char *ptr = NULL;
@@ -1097,7 +1097,7 @@ static int tcp_parse_tcp_rep(char **args, int section_type, struct proxy *curpx,
  * keyword.
  */
 static int tcp_parse_tcp_req(char **args, int section_type, struct proxy *curpx,
-                             struct proxy *defpx, const char *file, int line,
+                             const struct proxy *defpx, const char *file, int line,
                              char **err)
 {
 	const char *ptr = NULL;
diff --git a/src/tcpcheck.c b/src/tcpcheck.c
index 0fe3d10cd..37d3b38ca 100644
--- a/src/tcpcheck.c
+++ b/src/tcpcheck.c
@@ -3680,7 +3680,7 @@ int add_tcpcheck_send_strs(struct tcpcheck_rules *rules, const char * const *str
 
 /* Parses the "tcp-check" proxy keyword */
 static int proxy_parse_tcpcheck(char **args, int section, struct proxy *curpx,
-				struct proxy *defpx, const char *file, int line,
+				const struct proxy *defpx, const char *file, int line,
 				char **errmsg)
 {
 	struct tcpcheck_ruleset *rs = NULL;
@@ -3764,7 +3764,7 @@ static int proxy_parse_tcpcheck(char **args, int section, struct proxy *curpx,
 
 /* Parses the "http-check" proxy keyword */
 static int proxy_parse_httpcheck(char **args, int section, struct proxy *curpx,
-				 struct proxy *defpx, const char *file, int line,
+				 const struct proxy *defpx, const char *file, int line,
 				 char **errmsg)
 {
 	struct tcpcheck_ruleset *rs = NULL;
diff --git a/src/vars.c b/src/vars.c
index c101c7288..65930c984 100644
--- a/src/vars.c
+++ b/src/vars.c
@@ -798,7 +798,7 @@ static enum act_parse_ret parse_store(const char **args, int *arg, struct proxy
 }
 
 static int vars_max_size(char **args, int section_type, struct proxy *curpx,
-                         struct proxy *defpx, const char *file, int line,
+                         const struct proxy *defpx, const char *file, int line,
                          char **err, unsigned int *limit)
 {
 	char *error;
@@ -812,42 +812,42 @@ static int vars_max_size(char **args, int section_type, struct proxy *curpx,
 }
 
 static int vars_max_size_global(char **args, int section_type, struct proxy *curpx,
-                                struct proxy *defpx, const char *file, int line,
+                                const struct proxy *defpx, const char *file, int line,
                                 char **err)
 {
 	return vars_max_size(args, section_type, curpx, defpx, file, line, err, &var_global_limit);
 }
 
 static int vars_max_size_proc(char **args, int section_type, struct proxy *curpx,
-                                struct proxy *defpx, const char *file, int line,
+                                const struct proxy *defpx, const char *file, int line,
                                 char **err)
 {
 	return vars_max_size(args, section_type, curpx, defpx, file, line, err, &var_proc_limit);
 }
 
 static int vars_max_size_sess(char **args, int section_type, struct proxy *curpx,
-                              struct proxy *defpx, const char *file, int line,
+                              const struct proxy *defpx, const char *file, int line,
                               char **err)
 {
 	return vars_max_size(args, section_type, curpx, defpx, file, line, err, &var_sess_limit);
 }
 
 static int vars_max_size_txn(char **args, int section_type, struct proxy *curpx,
-                             struct proxy *defpx, const char *file, int line,
+                             const struct proxy *defpx, const char *file, int line,
                              char **err)
 {
 	return vars_max_size(args, section_type, curpx, defpx, file, line, err, &var_txn_limit);
 }
 
 static int vars_max_size_reqres(char **args, int section_type, struct proxy *curpx,
-                                struct proxy *defpx, const char *file, int line,
+                                const struct proxy *defpx, const char *file, int line,
                                 char **err)
 {
 	return vars_max_size(args, section_type, curpx, defpx, file, line, err, &var_reqres_limit);
 }
 
 static int vars_max_size_check(char **args, int section_type, struct proxy *curpx,
-                                struct proxy *defpx, const char *file, int line,
+                                const struct proxy *defpx, const char *file, int line,
                                 char **err)
 {
 	return vars_max_size(args, section_type, curpx, defpx, file, line, err, &var_check_limit);
diff --git a/src/wurfl.c b/src/wurfl.c
index 6030c4c90..8ec17836d 100644
--- a/src/wurfl.c
+++ b/src/wurfl.c
@@ -129,7 +129,7 @@ typedef struct {
  * configuration parameters parsing functions
  */
 static int ha_wurfl_cfg_data_file(char **args, int section_type, struct proxy *curpx,
-                                  struct proxy *defpx, const char *file, int line,
+                                  const struct proxy *defpx, const char *file, int line,
                                   char **err)
 {
 
@@ -143,7 +143,7 @@ static int ha_wurfl_cfg_data_file(char **args, int section_type, struct proxy *c
 }
 
 static int ha_wurfl_cfg_cache(char **args, int section_type, struct proxy *curpx,
-                              struct proxy *defpx, const char *file, int line,
+                              const struct proxy *defpx, const char *file, int line,
                               char **err)
 {
 	if (*(args[1]) == 0) {
@@ -156,7 +156,7 @@ static int ha_wurfl_cfg_cache(char **args, int section_type, struct proxy *curpx
 }
 
 static int ha_wurfl_cfg_engine_mode(char **args, int section_type, struct proxy *curpx,
-                                    struct proxy *defpx, const char *file, int line,
+                                    const struct proxy *defpx, const char *file, int line,
                                     char **err)
 {
 	// kept for backward conf file compat
@@ -164,7 +164,7 @@ static int ha_wurfl_cfg_engine_mode(char **args, int section_type, struct proxy
 }
 
 static int ha_wurfl_cfg_information_list_separator(char **args, int section_type, struct proxy *curpx,
-                                                   struct proxy *defpx, const char *file, int line,
+                                                   const struct proxy *defpx, const char *file, int line,
                                                    char **err)
 {
 	if (*(args[1]) == 0) {
@@ -182,7 +182,7 @@ static int ha_wurfl_cfg_information_list_separator(char **args, int section_type
 }
 
 static int ha_wurfl_cfg_information_list(char **args, int section_type, struct proxy *curpx,
-                                         struct proxy *defpx, const char *file, int line,
+                                         const struct proxy *defpx, const char *file, int line,
                                          char **err)
 {
 	int argIdx = 1;
@@ -212,7 +212,7 @@ static int ha_wurfl_cfg_information_list(char **args, int section_type, struct p
 }
 
 static int ha_wurfl_cfg_patch_file_list(char **args, int section_type, struct proxy *curpx,
-                                        struct proxy *defpx, const char *file, int line,
+                                        const struct proxy *defpx, const char *file, int line,
                                         char **err)
 {
 	int argIdx = 1;
@@ -240,7 +240,7 @@ static int ha_wurfl_cfg_patch_file_list(char **args, int section_type, struct pr
 }
 
 static int ha_wurfl_cfg_useragent_priority(char **args, int section_type, struct proxy *curpx,
-                                           struct proxy *defpx, const char *file, int line,
+                                           const struct proxy *defpx, const char *file, int line,
                                            char **err)
 {
 	// this feature is deprecated, keeping only not to break compatibility