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First, to be called on HTX streams, a filter must explicitly be declared as compatible by setting the flag STRM_FLT_FL_HAS_FILTERS on the filter's config at HAProxy startup. This flag is checked when a filter implementation is attached to a stream. Then, some changes have been made on HTTP callbacks. The callback http_payload has been added to filter HTX data. It will be called on HTX streams only. It replaces the callbacks http_data, http_chunk_trailers and http_forward_data, called on legacy HTTP streams only and marked as deprecated. The documention (once updated)) will give all information to implement this new callback. Other HTTP callbacks will be called for HTX and HTTP legacy streams. So it is the filter's responsibility to known which kind of data it handles. The macro IS_HTX_STRM should be used in such cases. There is at least a noticeable changes in the way data are forwarded. In HTX, after the call to the callback http_headers, all the headers are considered as forwarded. So, in http_payload, only the body and eventually the trailers will be filtered. |
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