Hi, In my module I have a body filter. In the body filter, I respond with a 4XX if the body contains a matching pattern. This is working correctly.
However, I would like to send a custom response message when the above situation occurs. I tried doing this by attaching a buffer to the output headers and calling send header before returning from the filter handler as shown below. ----------------------------------------------------------------------- r->err_status = http_status; r->headers_out.status = http_status; r->headers_out.content_length_n = buf->last - buf->pos; ngx_str_set(&r->headers_out.content_type, "text/plain"); rc = ngx_http_send_header(r); ----------------------------------------------------------------------- However, this causes the "header already sent" error to be raised in the error.log. The reason for this is because, ngx_http_core_content_phase calls ngx_http_finalize_request after returning from the body filter. ngx_http_finalize_request calls ngx_http_special_response_handler if the body filter returns any codes greater than NGX_HTTP_SPECIAL_RESPONSE. The ngx_http_special_response_handler in turn calls ngx_http_send_special_response which again tries to send the response header using the stock error message in the ngx_http_error_pages array for the return code in question. The alert is raised since we already sent it. Is there a way to prevent the special_response handler from either sending this message again or use the buffer attached to the request in the body filter? Thanks and regards, Dk.
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