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[Bug 62359] New: cannot add an output filter from lua code


https://bz.apache.org/bugzilla/show_bug.cgi?id=62359

            Bug ID: 62359
           Summary: cannot add an output filter from lua code
           Product: Apache httpd-2
           Version: 2.4-HEAD
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: mod_lua
          Assignee: bugs@xxxxxxxxxxxxxxxx
          Reporter: massimiliano.calandrelli@xxxxxxxxx
  Target Milestone: ---

Created attachment 35921
  --> https://bz.apache.org/bugzilla/attachment.cgi?id=35921&action=edit
path to solve the problem

Output filters written in lua will only work if the filter is added to the
chain by means of configuration statements.
If you need to add an output filter from lua code hooked to some earlier point
in the request's lifecycle, no output will be produced.

This happens because the C code bound to the lua request_req:add_output_filter
method incorrectly set the filter's context to the lua state.
The correct behaviour is to let the lua_output_filter_handle (in mod_lua.c)
function create the context by setting it to NULL in the ap_add_output_filter
call made by req_add_output_filter (in lua_request.c).

BTW, as far as I can see, the documentation wrongly states the function name
(correct: add_output_filter, documented: addoutputfilter) and parameter's
semantics, in that it can only be a filter name and not a function)

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