rpc/client/http: log error

[melekes]

Closes #3410

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[codecov]

Codecov Report

Merging #5182 into master will increase coverage by 1.62%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5182      +/-   ##
==========================================
+ Coverage   60.84%   62.46%   +1.62%     
==========================================
  Files         203      259      +56     
  Lines       20531    27272    +6741     
==========================================
+ Hits        12492    17036    +4544     
- Misses       6962     8747    +1785     
- Partials     1077     1489     +412     

Impacted Files	Coverage Δ
blockchain/v2/routine.go	73.13% <0.00%> (-7.47%)	⬇️
blockchain/v0/pool.go	78.02% <0.00%> (-1.28%)	⬇️
consensus/replay.go	72.57% <0.00%> (-0.85%)	⬇️
blockchain/v0/reactor.go	64.18% <0.00%> (ø)
privval/utils.go	37.50% <0.00%> (ø)
p2p/trust/config.go	100.00% <0.00%> (ø)
p2p/peer.go	58.59% <0.00%> (ø)
privval/file.go	70.29% <0.00%> (ø)
p2p/metrics.go	95.23% <0.00%> (ø)
p2p/pex/known_address.go	57.14% <0.00%> (ø)
... and 57 more