GSP-706: Support HTTP Signer

[JinnyYi]

ref: #646

[codecov]

Codecov Report

Merging #706 (a38f002) into master (f14e890) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #706   +/-   ##
=======================================
  Coverage   12.35%   12.35%           
=======================================
  Files          22       22           
  Lines        1441     1441           
=======================================
  Hits          178      178           
  Misses       1256     1256           
  Partials        7        7           

Flag	Coverage Δ
unittests	12.35% <ø> (ø)

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