Related: bug 347864. According to that bug, we want to move away from both Perl and PHP to use wptserve if possible.

Note: the files mentioned here are in LayoutTests/http/tests/xmlhttprequest/resources; there's currently no echo-requests.php but a echo-request-headers.php could be added based on echo-request-origin.php/echo-request-method.php.

These are the places where print-headers.cgi is still used:
  https://cs.chromium.org/search/?q=print-headers.cgi

tyoshino@, are you still planning to do this later?

qyearsley: I filed this just for reducing duplicated files for the same purpose. So, moving to wptserve is fine and really good. I haven't done anything. I'll unassign myself for now. Feel free to work on this or assign someone else.

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As expressed I think this is now a WontFix, both print-headers.cgi and echo-requests.php should ideally be migrated to wptserve. robertma@ has discussed enabling wptserve outside of external/wpt. That's a subset of issue 347864, so that might be a good issue to follow.