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Posted to bugs@httpd.apache.org by bu...@apache.org on 2017/05/23 14:35:22 UTC
[Bug 46969] CustomLog format %m always GET on errors with local
ErrorDocument
https://bz.apache.org/bugzilla/show_bug.cgi?id=46969
--- Comment #3 from Petar Bogdanovic <pe...@smokva.net> ---
ErrorDocuments are delivered through internal redirects so we end up
with two requests, the original (POST) and the new request (GET).
When resolving REQUEST_METHOD, you should try to resolve the original
REQUEST_METHOD (which would be %<{REQUEST_METHOD}e in mod_log_config
lingo). Otherwise it will always resolve to "GET" in case of internal
redirects to some ErrorDocument.
It's different with %m, %m will always be "GET" by design:
httpd-2.4.25/modules/http/http_request.c:
188 else if (custom_response[0] == '/') {
189 const char *error_notes;
190 r->no_local_copy = 1; /* Do NOT send HTTP_NOT_MODIFIED for
191 * error documents! */
192 /*
193 * This redirect needs to be a GET no matter what the original
194 * method was.
195 */
196 apr_table_setn(r->subprocess_env, "REQUEST_METHOD", r->method);
197
198 /*
199 * Provide a special method for modules to communicate
200 * more informative (than the plain canned) messages to us.
201 * Propagate them to ErrorDocuments via the ERROR_NOTES variable:
202 */
203 if ((error_notes = apr_table_get(r->notes,
204 "error-notes")) != NULL) {
205 apr_table_setn(r->subprocess_env, "ERROR_NOTES", error_notes);
206 }
207 r->method = "GET";
208 r->method_number = M_GET;
209 ap_internal_redirect(custom_response, r);
210 return;
211 }
Here, apr_die_r saves the original method into REQUEST_METHOD before
resetting method/method_number to "GET"/M_GET and the comment before
apr_table_setn indicates that this is done on purpose.
So if you need the original method, use %<{REQUEST_METHOD}e instead of %m.
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