On Mon, 5 May 2025, Christian Kujau wrote:

Yes, it was some Rewrite snafu after all. Installed a fresh Mediawiki on the same machine with a different path, and as soon as I enabled the ShortURL hacks the same thing happened.

FWIW, I still find the "error message" kinda confusing: HTTP/200 for GET, but HTTP/404 for POST, I didn't know where to go from here. But, strace(1) was able to shed some light:

$ sudo strace -tt --decode-pids=comm -s1024 -f -o /tmp/foo \ -p $(echo $(pgrep php) $(pgrep apache) | sed 's/ /,/g')

I did not know wether Apache or PHP-FPM was actually triggering the HTTP/404 so I straced both process groups. And there it was:

3644181<apache2> 00:15:12.341845 newfstatat(AT_FDCWD, "/var/www/wiki/Special:Upload", <unfinished ...> 3644187<apache2> 00:15:12.341864 epoll_wait(25, <unfinished ...> 3644181<apache2> 00:15:12.341890 <... newfstatat resumed>0x76c09e71ba60, 0) = -1 ENOENT (No such file or directory) 3644181<apache2> 00:15:12.341929 newfstatat(AT_FDCWD, "/var", {st_mode=S_IFDIR|0755, st_size=70, ...}, AT_SYMLINK_NOFOLLOW) = 0 3644181<apache2> 00:15:12.342006 newfstatat(AT_FDCWD, "/var/www", {st_mode=S_IFDIR|0755, st_size=124, ...}, AT_SYMLINK_NOFOLLOW) = 0AT_SYMLINK_NOFOLLOW) = 0 3644181<apache2> 00:15:12.342147 newfstatat(AT_FDCWD, "/var/www/wiki", 0x76c09e71ba60, AT_SYMLINK_NOFOLLOW) = -1 ENOENT (No such file or directory)

But /var/www/wiki does not exist, only /var/www/mediawiki does, so in the end that ticked me off that all this was caused by that ShortURL hackery.

Oh well, it works now :-)

Gif is included by default and they are adding to the default values, so gif is in there.

If a file extension didnt match the list it would still give a 200 status code, just with an error message, and not a 404.

On Sunday, 4 May 2025, Jeffrey T. Darlington jeff.darlington@gmail.com wrote:

This is just a hunch, but $wgFileExtensions does not contain "gif" as an allowed extension for uploading.

https://www.mediawiki.org/wiki/Manual:$wgFileExtensions

On Sun, May 4, 2025 at 5:53 PM Christian Kujau lists@nerdbynature.de wrote:

...

Hello list,

for some reason I'm no longer able to use the upload function on my little Mediawiki installation. I haven't uploaded things a while, and recently updated to 1.43.1, and everything else appears to work quite well, except uploads. So, I navigate to Special:Upload and in the Apache web server log I can see (shortened, w/o IP adresses and user information):

"GET /wiki/Special:Upload HTTP/2.0" 200 5795 "-" "Mozilla...

Great, HTTP/200 looks good, and the "Upload file" page is being displayed, and I click on "choose file" and select a .gif and the .gif is displayed now displayed as a little preview in the "Source file" part of the Upload page. But then I hit the "Upload file" at the bottom of the page and get a "Not Found" message in my browser window. And the same Apache web server log now has:

"POST /wiki/Special:Upload HTTP/2.0" 404 291 " https://foo.example.org/wiki/Special:Upload" "Mozilla...

So, GET works just fine, but POST produces a HTTP/404?

I've disabled mod_security, disabled all CSP and X-XSS-Protection etc. headers too, but I'm at a loss on how to debug this further.

In my virtual host configuration of the Apache web server, the following is included:

RewriteRule ^/wiki/(.+)?$ /mediawiki/index.php [L]

This worked quite well over the years, and I *was* able to upload stuff before, and with that configuration too.

Attached below is my (shortened) LocalSettings.php (w/o some database secrets and names).

Has anybody seen something like this before, and maybe even remembers where to look to debug this?

Thank you, Christian.

===== LocalSettings.php $wgSitename = "foo"; $wgScriptPath = "/mediawiki"; # real path $wgArticlePath = "/wiki/$1"; # virtual path $wgUsePathInfo = true; # ? $wgServer = "https://foo.example.org"; $wgEnotifUserTalk = true; # UPO $wgEnotifWatchlist = true; # UPO $wgEmailAuthentication = true; $wgDBtype = "mysql"; $wgDBserver = "127.0.0.1"; $wgDBname = "foo"; $wgDBuser = "foo"; $wgDBpassword = "xxxx"; $wgDBprefix = ""; $wgMainCacheType = CACHE_ACCEL; $wgCachePages = true; $wgParserCacheExpireTime = 604800; $wgUseFileCache = true; $wgEnableSidebarCache = true; $wgShowIPinHeader = false; $wgEnableUploads = true; $wgUseImageMagick = true; $wgImageMagickConvertCommand = "/usr/bin/convert"; $wgShellLocale = "en_US.utf8"; $wgCacheDirectory = "$IP/cache"; $wgFileCacheDirectory = "$wgCacheDirectory/html"; $wgLanguageCode = "en"; $wgSecretKey = "xxxx"; $wgUpgradeKey = "xxx"; $wgDefaultSkin = "Vector"; $wgDiff3 = "/usr/bin/diff3"; $wgGroupPermissions['*']['read'] = true; $wgGroupPermissions['*']['edit'] = false; $wgGroupPermissions['*']['createaccount'] = false; $wgNoFollowLinks = false; $wgNamespacesWithSubpages[NS_MAIN] = true; $wgAllowExternalImages = true; $wgAllowCopyUploads = true; $wgCopyUploadsFromSpecialUpload = true; $wgFileExtensions = array_merge($wgFileExtensions, array( 'pdf', 'txt', 'gz', 'bz2', 'deb', 'zip', 'svg', 'diff', 'json' )); $wgVerifyMimeType = false; $wgDisableUploadScriptChecks = true; $wgExtraNamespaces = array( $wgNamespacesWithSubpages[NS_FOO] = true; $wgNamespacesWithSubpages[NS_FOO] = true; $wgShowExceptionDetails = true; $wgDevelopmentWarnings = true; $wgSitemapNamespaces = array( 0, 4, 12 ); $wgAllowTitlesInSVG = true; $wgSVGConverter = 'ImageMagick'; wfLoadSkin('Vector'); wfLoadSkin('MinervaNeue'); wfLoadSkin('Timeless');

-- BOFH excuse #308:

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