Hey folks I am writing to gather feedback on an idea before doing the implementation. Per the documentation, converter "bytes" accepts integer values as arguments, but not txn args. i.e. <fetch>,bytes(2,8) will work but <fetch>,bytes(txn.start_idx,txn.length) will not work.
For our use case, we need to parse some binary data (a cookie) to extract some info in haproxy. However, the bytes that need to be extracted are not fixed and will depend on the request. We could use simple arithmetic to determine the index/length for bytes to be extracted and store them in txn args. These txn args can then be used with converter "bytes". I can see that the converter "sub" already supports txn args as arguments. I have successfully validated the proposed idea with an implementation following the same pattern as "sub". Let me know what you think. If there are no concerns, I can send a patch. Thanks Lokesh
