appsec: better handle chunked requests

[blotus]

We were relying on the content-length header to compute the size of the buffer we need to allocate to store the body, but in the case of chunked requests, the content length is not set, thus we were allocating a 0 byte buffer.

Do not try to be smart, and read as much as we can.

We ignore unexpected EOF errors because some requests might set an invalid content-length header.

[github-actions]

@blotus: There are no 'kind' label on this PR. You need a 'kind' label to generate the release automatically.

• /kind feature
• /kind enhancement
• /kind refactoring
• /kind fix
• /kind chore
• /kind dependencies

Details

I am a bot created to help the crowdsecurity developers manage community feedback and contributions. You can check out my manifest file to understand my behavior and what I can do. If you want to use this for your project, you can check out the BirthdayResearch/oss-governance-bot repository.

[github-actions]

@blotus: There are no area labels on this PR. You can add as many areas as you see fit.

• /area agent
• /area local-api
• /area cscli
• /area appsec
• /area security
• /area configuration

Details

I am a bot created to help the crowdsecurity developers manage community feedback and contributions. You can check out my manifest file to understand my behavior and what I can do. If you want to use this for your project, you can check out the BirthdayResearch/oss-governance-bot repository.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 11 lines in your changes missing coverage. Please review.

Project coverage is 54.51%. Comparing base (fb733ee) to head (9ed95e7).

Files with missing lines	Patch %	Lines
pkg/appsec/request.go	0.00%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3342      +/-   ##
==========================================
- Coverage   58.38%   54.51%   -3.88%     
==========================================
  Files         351      351              
  Lines       37827    37829       +2     
==========================================
- Hits        22087    20623    -1464     
- Misses      13831    15372    +1541     
+ Partials     1909     1834      -75     

Flag	Coverage Δ
bats	41.22% <0.00%> (-0.02%)	⬇️
unit-linux	?
unit-windows	29.66% <0.00%> (+<0.01%)	⬆️

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