diff --git a/src/server/ocsigen_server.ml b/src/server/ocsigen_server.ml
index 7cedee1e7..78abcbee4 100644
--- a/src/server/ocsigen_server.ml
+++ b/src/server/ocsigen_server.ml
@@ -401,7 +401,51 @@ let exec config =
       Lwt_log.ign_warning ~section "Multiple servers not supported anymore"
 (* Multiple servers not supported any more *)
 
-let start instructions =
+let start ?(ports = [`All, 8080]) ?ssl_ports ?ssl_info ?default_charset ?logdir
+    ?datadir ?syslog_facility ?configfile ?usedefaulthostname ?pidfile ?mimefile
+    ?verbose ?veryverbose ?silent ?daemon ?debug ?debugmode ?minthreads
+    ?maxthreads ?max_number_of_threads_queued ?max_number_of_connections
+    ?client_timeout ?server_timeout ?shutdown_timeout ?filebuffersize
+    ?maxrequestbodysize ?maxrequestbodysizeinmemory ?bindir ?extdir
+    ?command_pipe ?disablepartialrequests ?respect_pipeline ?maxretries
+    instructions
+  =
+  Ocsigen_config.set_ports ports;
+  Option.iter Ocsigen_config.set_ssl_ports ssl_ports;
+  Option.iter Ocsigen_config.set_logdir logdir;
+  Option.iter Ocsigen_config.set_syslog_facility syslog_facility;
+  Option.iter Ocsigen_config.set_configfile configfile;
+  Option.iter Ocsigen_config.set_pidfile pidfile;
+  Option.iter Ocsigen_config.set_mimefile mimefile;
+  Option.iter Ocsigen_config.set_verbose verbose;
+  Option.iter Ocsigen_config.set_silent silent;
+  Option.iter Ocsigen_config.set_daemon daemon;
+  Option.iter Ocsigen_config.set_veryverbose veryverbose;
+  Option.iter Ocsigen_config.set_debug debug;
+  Option.iter Ocsigen_config.set_minthreads minthreads;
+  Option.iter Ocsigen_config.set_maxthreads maxthreads;
+  Option.iter Ocsigen_config.set_max_number_of_threads_queued
+    max_number_of_threads_queued;
+  Option.iter Ocsigen_config.set_max_number_of_connections
+    max_number_of_connections;
+  Option.iter Ocsigen_config.set_client_timeout client_timeout;
+  Option.iter Ocsigen_config.set_server_timeout server_timeout;
+  Option.iter Ocsigen_config.set_filebuffersize filebuffersize;
+  Option.iter Ocsigen_config.set_maxrequestbodysize maxrequestbodysize;
+  Option.iter Ocsigen_config.set_maxrequestbodysizeinmemory
+    maxrequestbodysizeinmemory;
+  Option.iter Ocsigen_config.set_default_charset default_charset;
+  Option.iter Ocsigen_config.set_datadir datadir;
+  Option.iter Ocsigen_config.set_bindir bindir;
+  Option.iter Ocsigen_config.set_extdir extdir;
+  Option.iter Ocsigen_config.set_command_pipe command_pipe;
+  Option.iter Ocsigen_config.set_debugmode debugmode;
+  Option.iter Ocsigen_config.set_disablepartialrequests disablepartialrequests;
+  Option.iter Ocsigen_config.set_usedefaulthostname usedefaulthostname;
+  Option.iter Ocsigen_config.set_respect_pipeline respect_pipeline;
+  Option.iter Ocsigen_config.set_maxretries maxretries;
+  Option.iter Ocsigen_config.set_shutdown_timeout shutdown_timeout;
+  Option.iter Ocsigen_config.set_ssl_info ssl_info;
   main (fun () ->
     Ocsigen_extensions.start_initialisation ();
     Ocsigen_extensions.set_hosts instructions)
diff --git a/src/server/ocsigen_server.mli b/src/server/ocsigen_server.mli
index 6be7709a6..d77659b80 100644
--- a/src/server/ocsigen_server.mli
+++ b/src/server/ocsigen_server.mli
@@ -29,7 +29,42 @@ val reload : ?file:string -> unit -> unit
 val exec : Xml.xml list list -> unit
 (** Start the server with a configuration file. Never returns. *)
 
-val start : Ocsigen_extensions.host_config list -> unit
+val start :
+   ?ports:(Ocsigen_config.Socket_type.t * int) list
+  -> ?ssl_ports:(Ocsigen_config.Socket_type.t * int) list
+  -> ?ssl_info:Ocsigen_config.ssl_info option
+  -> ?default_charset:string option
+  -> ?logdir:string
+  -> ?datadir:string
+  -> ?syslog_facility:Lwt_log.syslog_facility option
+  -> ?configfile:string
+  -> ?usedefaulthostname:bool
+  -> ?pidfile:string
+  -> ?mimefile:string
+  -> ?verbose:unit
+  -> ?veryverbose:unit
+  -> ?silent:unit
+  -> ?daemon:unit
+  -> ?debug:unit
+  -> ?debugmode:bool
+  -> ?minthreads:int
+  -> ?maxthreads:int
+  -> ?max_number_of_threads_queued:int
+  -> ?max_number_of_connections:int
+  -> ?client_timeout:int
+  -> ?server_timeout:int
+  -> ?shutdown_timeout:float option
+  -> ?filebuffersize:int
+  -> ?maxrequestbodysize:int64 option
+  -> ?maxrequestbodysizeinmemory:int
+  -> ?bindir:string
+  -> ?extdir:string
+  -> ?command_pipe:string
+  -> ?disablepartialrequests:bool
+  -> ?respect_pipeline:unit
+  -> ?maxretries:int
+  -> Ocsigen_extensions.host_config list
+  -> unit
 (** Start the server with some instructions. Never returns. *)
 
 type instruction =