Re-enable content-length request test

[sagebind]

No description provided.

[codecov]

Codecov Report

Merging #383 (75c3e84) into master (fad86fd) will increase coverage by 0.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #383      +/-   ##
==========================================
+ Coverage   79.59%   79.72%   +0.13%     
==========================================
  Files          52       52              
  Lines        3092     3103      +11     
==========================================
+ Hits         2461     2474      +13     
+ Misses        631      629       -2     

Impacted Files	Coverage Δ
tests/request_body.rs	100.00% <ø> (ø)
src/agent/selector.rs	76.13% <0.00%> (+0.55%)	⬆️
src/client.rs	80.07% <0.00%> (+0.75%)	⬆️

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