diff --git a/stdlib/apis/common/api_libs.opa b/stdlib/apis/common/api_libs.opa
index a43e2c86..cb228b92 100644
--- a/stdlib/apis/common/api_libs.opa
+++ b/stdlib/apis/common/api_libs.opa
@@ -33,8 +33,8 @@ API_libs_private = {{
  /**
   * Alias to easily manage the jlog of API modules
   */
-  apijlog(_text:string) =
-    //jlog(text)
+  apijlog(text:string) =
+    do jlog(text)
     void
 
   /* -------------- */
diff --git a/stdlib/apis/oauth/oauth.opa b/stdlib/apis/oauth/oauth.opa
index 0e99d730..89d75a04 100644
--- a/stdlib/apis/oauth/oauth.opa
+++ b/stdlib/apis/oauth/oauth.opa
@@ -57,6 +57,7 @@ type OAuth.parameters = {
   authorize_uri     : string
   http_method       : OAuth.method
   inlined_auth      : bool
+  custom_headers    : option(string)
 }
 
 type OAuth.token = {
@@ -148,7 +149,7 @@ type OAuth.token_res = { success : OAuth.token } / { error : string }
     [("oauth_consumer_key", p.consumer_key), ("oauth_timestamp", "{timestamp}"),
      ("oauth_nonce", "{nonce}"), ("oauth_version", "1.0")]
 
-  get_res(more_auth, secret, uri, params, parse_fun) =
+  get_res_2(more_auth, secret, uri, params) =
     auth_params = build_basic_params()
       |> List.append(_, more_auth)
       |> sign_request(secret, uri, params, _)
@@ -174,32 +175,31 @@ type OAuth.token_res = { success : OAuth.token } / { error : string }
     res = match p.http_method with
     | {GET} ->
       uri = if params_text == "" then uri else "{uri}?{params_text}"
-      options = {WebClient.Get.default_options with auth=auth}
+      options = {WebClient.Get.default_options with auth=auth custom_headers=p.custom_headers}
       do API_libs_private.apijlog("URI: \n{uri}")
       match Uri.of_string(uri) with
-      | {none} -> ""
-      | {some=u} ->
-        match WebClient.Get.try_get_with_options(u, options) with
-        | {failure=_} -> ""
-        | {success=s} -> s.content
-        end
+      | {none} -> error("_______")
+      | {some=u} -> WebClient.Get.try_get_with_options(u, options)
       end
     | {POST} ->
       do API_libs_private.apijlog("URI: \n{uri}")
       options = {WebClient.Post.default_options with
+                    custom_headers=p.custom_headers
                     auth=auth
                     content=(if params_text == "" then {none}
                              else {some=params_text})}
       match Uri.of_string(uri) with
-      | {none} -> ""
-      | {some=u} ->
-        match WebClient.Post.try_post_with_options(u, options) with
-        | {failure=_} -> ""
-        | {success=s} -> s.content
-        end
+      | {none} -> error("_______")
+      | {some=u} -> WebClient.Post.try_post_with_options(u, options)
       end
     do API_libs_private.apijlog("Result: '''{res}'''")
-    parse_fun(res)
+    res
+
+  get_res(more_auth, secret, uri, params, parse_fun) =
+    match get_res_2(more_auth, secret, uri, params) with
+    | {failure=_} -> parse_fun("")
+    | {success=s} -> parse_fun(s.content)
+    end
 
   get_request_token(callback) =
     more_auth =
@@ -217,9 +217,17 @@ type OAuth.token_res = { success : OAuth.token } / { error : string }
     get_res(more_auth, request_secret, p.access_token_uri, [], build_result)
 
   get_protected_resource(uri, params, access_key, access_secret) =
-    more_auth = [("oauth_token", access_key)]
+    more_auth = match access_key
+      | "" -> []
+      | _ -> [("oauth_token", access_key)]
     get_res(more_auth, access_secret, uri, params, identity)
 
+  get_protected_resource2(uri, params, access_key, access_secret) =
+    more_auth = match access_key
+      | "" -> []
+      | _ -> [("oauth_token", access_key)]
+    get_res_2(more_auth, access_secret, uri, params)
+
 }}
 
 /**
@@ -307,4 +315,14 @@ OAuth(parameters:OAuth.parameters) = {{
       uri, params, access_token, access_secret
     )
 
+  get_protected_resource_2(
+    uri : string,
+    params : list((string, string)),
+    access_token : string,
+    access_secret : string
+  ) =
+    OAuth_private(p).get_protected_resource2(
+      uri, params, access_token, access_secret
+    ) : outcome
+
 }}
diff --git a/stdlib/apis/twitter/twitter.opa b/stdlib/apis/twitter/twitter.opa
index bf24003f..63a4a6f0 100644
--- a/stdlib/apis/twitter/twitter.opa
+++ b/stdlib/apis/twitter/twitter.opa
@@ -475,6 +475,7 @@ type Twitter.rate_limit = {
     access_token_uri  = "https://api.twitter.com/oauth/access_token"
     http_method       = http_method
     inlined_auth      = false
+    custom_headers    = none
   } : OAuth.parameters)
 
 
@@ -614,6 +615,7 @@ Twitter(conf:Twitter.configuration) = {{
     access_token_uri  = "https://api.twitter.com/oauth/access_token"
     http_method       = {POST}
     inlined_auth      = false
+    custom_headers    = none
   } : OAuth.parameters
 
 
diff --git a/stdlib/core/web/client/web_client.opa b/stdlib/core/web/client/web_client.opa
index 91355349..a55de399 100644
--- a/stdlib/core/web/client/web_client.opa
+++ b/stdlib/core/web/client/web_client.opa
@@ -113,6 +113,7 @@ type WebClient.Head.options =
  {
    auth: option(string)
    custom_headers: option(string)
+
    custom_agent:   option(string)
    follow_redirects: int /*The maximal number of redirects to follow. By default, 0. Usually a bad idea to set it higher than 5.*/
    timeout_sec:      option(float)
diff --git a/stdlib/core/web/core/reply.opa b/stdlib/core/web/core/reply.opa
index aec90d81..46a79b11 100644
--- a/stdlib/core/web/core/reply.opa
+++ b/stdlib/core/web/core/reply.opa
@@ -118,6 +118,32 @@ type web_cache_control =  {volatile}    /** The resource changes at each request
 type web_server_status = external
 type WebInfo.private.native_http_header = external
 
+type Resource.cookie_attributes =
+    { comment:string }
+  / { domain:string }
+  / { max_age:int }
+  / { path:string }
+  / { secure:void }
+  / { version:int }
+
+type Resource.cookie_def = {
+  name : string ;
+  value : string ;
+  attributes : list(Resource.cookie_attributes) ;
+}
+
+type Resource.http_response_header =
+    { set_cookie:Resource.cookie_def }
+  / { age:int }
+  / { location:string }
+  / { retry_after: { date:string } / { delay:int } }
+  / { server: list(string) }
+  / { content_disposition : { attachment : string } }
+
+type Resource.http_general_header =
+    { lastm : web_cache_control }
+
+type Resource.http_header = Resource.http_general_header / Resource.http_response_header
 
 /**
  * {1 Interface}
@@ -165,17 +191,17 @@ WebCoreExport =
   | _ -> lst
 
 @private cookie_def_to_string(cd) =
-  cd.name ^ "=" ^ cd.value
-    ^ String.implode(cookie_attribute_to_string, ";", cd.attributes)
+  g = List.fold(x, acc -> Text.insert_right(acc, "; ") |> Text.insert_right(_, cookie_attribute_to_string(x)), cd.attributes, Text.cons(""))
+  "{cd.name}={cd.value}{g}"
 
 @private cookie_attribute_to_string(ca) =
   match ca with
-  | ~{comment} -> "Comment=" ^ comment
-  | ~{domain} -> "Domain=" ^ domain
-  | ~{max_age} -> "Max-Age={max_age}"
-  | ~{path} -> "Path=" ^ path
-  | {secure} -> "Secure"
-  | ~{version} -> "Version={version}"
+  | ~{comment} -> "comment=" ^ comment
+  | ~{domain} -> "domain=" ^ domain
+  | ~{max_age} -> "max-age={max_age}"
+  | ~{path} -> "path=" ^ path
+  | {secure} -> "secure"
+  | ~{version} -> "version={version}"
 
 @private to_ll_headers(headers : list(Resource.http_header)) : list(WebInfo.private.native_http_header) =
   List.foldl(add_ll_header, headers, [])
diff --git a/stdlib/core/web/resource/resource.opa b/stdlib/core/web/resource/resource.opa
index 25e98cbd..7d23d829 100644
--- a/stdlib/core/web/resource/resource.opa
+++ b/stdlib/core/web/resource/resource.opa
@@ -128,35 +128,7 @@ type platform_customization =
 type resource_content = external
 */
 
-/**
- * {1 Interface}
- */
-type Resource.cookie_attributes =
-    { comment:string }
-  / { domain:string }
-  / { max_age:int }
-  / { path:string }
-  / { secure:void }
-  / { version:int }
-
-type Resource.cookie_def = {
-  name : string ;
-  value : string ;
-  attributes : list(Resource.cookie_attributes) ;
-}
-
-type Resource.http_response_header =
-    { set_cookie:Resource.cookie_def }
-  / { age:int }
-  / { location:string }
-  / { retry_after: { date:string } / { delay:int } }
-  / { server: list(string) }
-  / { content_disposition : { attachment : string } }
-
-type Resource.http_general_header =
-    { lastm : web_cache_control }
-
-type Resource.http_header = Resource.http_general_header / Resource.http_response_header
+
 
 
 Resource = {{
diff --git a/stdlib/core/web/resource/resource_private.opa b/stdlib/core/web/resource/resource_private.opa
index c45fd823..a9c79574 100644
--- a/stdlib/core/web/resource/resource_private.opa
+++ b/stdlib/core/web/resource/resource_private.opa
@@ -75,7 +75,7 @@ type resource_private_content =
  */
 type resource_private = { rc_content : resource_private_content;
                           rc_status  : web_response;
-                          rc_headers : list(WebCoreExport.http_header);
+                          rc_headers : list(Resource.http_header);
                         }
 
 type resource_cache_customizers = {
@@ -113,7 +113,7 @@ type dynamic_private_content =
 type dynamic_resource_private = { rc_name    : string;
                                   rc_content : dynamic_private_content;
                                   rc_status  : web_response;
-                                  rc_headers : list(WebCoreExport.http_header);
+                                  rc_headers : list(Resource.http_header);
                                 }
 
 /**
@@ -818,7 +818,7 @@ export_resource(external_css_files: list(string),
                   ),
                 make_response_with_headers: (
                     WebInfo.private.native_request, web_response,
-                    list(WebCoreExport.http_header), string, string
+                    list(Resource.http_header), string, string
                       -> WebInfo.private.native_response
                   )
                 ) =