Commit a10865db authored by Luca Toscano's avatar Luca Toscano
Browse files

core, mod_rewrite: introduce the 'redirect-keeps-vary' note 

                   to allow proper Vary header insertion when
                   dealing with a RewriteRule in a directory
                   context.

This change is an attempt to fix a long standing problem,
brought up while working on PR 58231. Our documentation clearly
states the following:

"If a HTTP header is used in a condition this header is added
to the Vary header of the response in case the condition
evaluates to true for the request."

This is currently not true for RewriteCond/Rules working in
a directory context, since when an internal redirect happens
all the outstanding response headers get dropped.

There might be a better solution so I am looking forward to
hear more opinions and comments. My goal for a delicate change
like this one would be to affect the least amount of configurations
possible, without triggering unwanted side effects.

If the solution is good for everybody tests will be written
in the suite asap.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1811744 13f79535-47bb-0310-9956-ffa450edef68
parent 75bfe011

CHANGES

+4 −0
Original line number Diff line number Diff line 
                                                         -*- coding: utf-8 -*-

Changes with Apache 2.5.0



  *) mod_rewrite, core: add the Vary header when a condition evaluates to true

     and the related RewriteRule is used in a Directory context

     (triggering an internal redirect). [Luca Toscano]



  *) ab: Make the TLS layer aware that the underlying socket is nonblocking,

     and use/handle POLLOUT where needed to avoid busy IOs and recover write

     errors when appropriate.  [Yann Ylavic]

modules/http/http_request.c

+11 −0
Original line number Diff line number Diff line
@@ -523,6 +523,7 @@ static request_rec *internal_internal_redirect(const char *new_uri, 
                                               request_rec *r) {

    int access_status;

    request_rec *new;

    const char *vary_header;



    if (ap_is_recursion_limit_exceeded(r)) {

        ap_die(HTTP_INTERNAL_SERVER_ERROR, r);
@@ -586,6 +587,16 @@ static request_rec *internal_internal_redirect(const char *new_uri, 
        if (location)

            apr_table_setn(new->headers_out, "Location", location);

    }



    /* A module (like mod_rewrite) can force an internal redirect

     * to carry over the Vary header (if present).

     */

    if (apr_table_get(r->notes, "redirect-keeps-vary")) {

        if((vary_header = apr_table_get(r->headers_out, "Vary"))) {

            apr_table_setn(new->headers_out, "Vary", vary_header);

        }

    }



    new->err_headers_out = r->err_headers_out;

    new->trailers_out    = apr_table_make(r->pool, 5);

    new->subprocess_env  = rename_original_env(r->pool, r->subprocess_env);

modules/mappers/mod_rewrite.c

+2 −0
Original line number Diff line number Diff line
@@ -5226,6 +5226,8 @@ static int hook_fixup(request_rec *r) 
                }

            }



            apr_table_setn(r->notes, "redirect-keeps-vary", "");



            /* now initiate the internal redirect */

            rewritelog((r, 1, dconf->directory, "internal redirect with %s "

                        "[INTERNAL REDIRECT]", r->filename));