I saw the source code of opensearch.php. The same happend to my locally installed dokuwiki too.
Too bad i can't reproduce it for opensearch.php.
But on
https://www.dokuwiki.org/lib/exe/js.php i can still see the source code, which is what i don't expect to see (same for my local dokuwiki):
Here an excerpt of js.php (seen in firefox and chrome):
var DOKU_BASE='/';var DOKU_TPL='/lib/tpl/dokuwiki/';var DOKU_COOKIE_PARAM={"path":"\/","secure":true};var DOKU_UHN=0;var DOKU_UHC=0;LANG={"willexpire":"Your lock for editing this page is about to expire in a minute.\\nTo avoid conflicts use the preview button to reset the locktimer.","notsavedyet":"Unsaved changes will be lost.","searchmedia":"Search for files","keepopen":"Keep window open on selection","hidedetails":"Hide Details","mediatitle":"Link settings","mediadisplay":"Link type","mediaalign":"Alignment","mediasize":"Image size","mediatarget":"Link target","mediaclose":"Close","mediainsert":"Insert","mediadisplayimg":"Show the image.","mediadisplaylnk":"Show only the link.","mediasmall":"Small version","mediamedium":"Medium version","medialarge":"Large version","mediaoriginal":"Original version","medialnk":"Link to detail page","mediadirect":"Direct link to original","medianolnk":"No link","medianolink":"Do not link the image","medialeft":"Align the image on the left.","mediaright":"Align the image on the right.","mediacenter":"Align the image in the middle.","medianoalign":"Use no align.","nosmblinks":"Linking to Windows shares only works in Microsoft Internet Explorer.\\nYou still can copy and paste the link.","linkwiz":"Link Wizard","linkto":"Link to:","del_confirm":"Really delete selected item(s)?","restore_confirm":"Really restore this version?","media_diff":"View differences:","media_diff_both":"Side by Side","media_diff_opacity":"Shine-through","media_diff_portions":"Swipe","media_select":"Select files\u2026","media_upload_btn":"Upload","media_done_btn":"Done","media_drop":"Drop files here to upload","media_cancel":"remove","media_overwrt":"Overwrite existing files","plugins":{"gallery":{"addgal":"Add namespace as gallery"},"styling":{"loader":"Preview is loading...<br \/>if this does not goes away, your values may be faulty","popup":"Open as a popup"},"extension":{"reallydel":"Really uninstall this extension?","display_viewoptions":"View