On 2015-12-09 15:02, Pechoultres Xavier wrote:
Hi everybody,

        I wrote an apache (2.2.x) module for special c++ app. It works fine for 
many years but a problem resist to me.

Apache automatically add a content-length header even I send a 
Transfer-Encoding: chunked

I set Transfer-Encoding: chunked in cgi module, I’m sure I do not set a 
content-length here.
I unset Content-length in my module :  apr_table_unset(r->headers_out, 
"Content-Length »);

I’ve tried lot of stuff without success, and Apache always add a 
content-length. This create bug with recent WebCore application.

If somebody can give me the light !

I've checked the sources of the apache server. Apache adds some filters to the request processing chain, two of them being ap_content_length_filter and ap_http_header_filter. ap_content_length_filter executes before ap_http_header_filter.

ap_content_length_filter sets the Content-Length header if it can determine the size of the response body. ap_http_header_filter sets r->chunked only if the Content-Length header is not set. The response is chunked and the "Transfer-Encoding: chunked" header is set only if r->chunked = 1.

In short: if apache can determine the size of the response message then you cannot force it to send "Transfer-Encoding: chunked" and it will always set the Content-Length header.

--
Sorin


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