Outbound msg limit

[krgko]

Currently, The ACA-py allows for setting --max-message-size for inbound transport only. I think someone who uses the webhook feature might need to apply that config for the outbound transport max message limit also due to large messages will lead to OutboundTransportError('Unexpected response status 413, caused by: Request Entity Too Large')

This PR might be useful for some use cases which use the webhook feature and large messages.

[codecov-commenter]

Codecov Report

Merging #725 into master will decrease coverage by 0.00%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master     #725      +/-   ##
==========================================
- Coverage   99.01%   99.01%   -0.01%     
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  Files         254      254              
  Lines       13763    13768       +5     
==========================================
+ Hits        13628    13632       +4     
- Misses        135      136       +1     

[andrewwhitehead]

I can't be sure if this is actually fixing an issue or if it's just putting a maximum size on the outbound requests. It seems like the 413 error is being sent by the receiving agent because the payload is too large for it, not because there's a limit on the outbound payload size.

[krgko]

Hello @andrewwhitehead , I've rechecked the AioHTTP document and found that max_client_size can config for inbound transportation. Thus, this PR will not help because the outbound max request size relies on the allowed inbound request size for destination service.

Thank you for your comment.