remove manual gzipping of request, as it's done automatically!

[metachris]

📝 Summary

Fixes #365 and replaces #382

http.Request automatically adds Accept-Encoding: gzip header and transparently decompresses the response. You can see this working in the test in this PR. Also see https://pkg.go.dev/net/http#Response.Uncompressed

But when the header is set manually, then it won't decode the response automatically, which is what we're seeing in #382

In fact, gzip was already support since the very beginning of mev-boost. :)

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✅ I have run these commands

• make lint
• make test-race
• go mod tidy

[codecov-commenter]

Codecov Report

Merging #383 (482c050) into main (1a11894) will increase coverage by 0.63%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #383      +/-   ##
==========================================
+ Coverage   66.02%   66.66%   +0.63%     
==========================================
  Files           7        7              
  Lines         889      888       -1     
==========================================
+ Hits          587      592       +5     
+ Misses        265      262       -3     
+ Partials       37       34       -3     

Flag	Coverage Δ
unittests	66.66% <ø> (+0.63%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
server/utils.go	75.67% <ø> (-0.33%)	⬇️
server/service.go	79.28% <0.00%> (+1.42%)	⬆️

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[metachris]

Merging this quickly because getPayload on the main branch is currently broken