ensure http response body is closed

[gammazero]

When appropriate, consume all body data before close to allow connection reuse.

[codecov]

Codecov Report

❌ Patch coverage is 55.55556% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.71%. Comparing base (77bd614) to head (6baa985).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
filestore/fsrefstore.go	0.00%	4 Missing ⚠️

@@            Coverage Diff             @@
##             main    #1103      +/-   ##
==========================================
+ Coverage   61.67%   61.71%   +0.03%     
==========================================
  Files         265      265              
  Lines       26528    26523       -5     
==========================================
+ Hits        16362    16368       +6     
+ Misses       8481     8470      -11     
  Partials     1685     1685              

Files with missing lines	Coverage Δ
bitswap/network/httpnet/httpnet.go	59.17% <100.00%> (+0.10%)	⬆️
gateway/backend_car_fetcher.go	80.51% <100.00%> (-0.50%)	⬇️
routing/http/client/client.go	75.53% <100.00%> (+0.06%)	⬆️
filestore/fsrefstore.go	46.10% <0.00%> (ø)

... and 9 files with indirect coverage changes

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