optimize: add cacheQuery for Request.URL.Query();

[dengoswei]

Change-Id: I1198254ec71ac38a750e2aacfd33f1111c450e76

[codecov]

Codecov Report

Merging #1466 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1466      +/-   ##
==========================================
+ Coverage   98.68%   98.68%   +<.01%     
==========================================
  Files          36       36              
  Lines        1895     1905      +10     
==========================================
+ Hits         1870     1880      +10     
  Misses         18       18              
  Partials        7        7

Impacted Files	Coverage Δ
context.go	99.49% <100%> (+0.01%)	⬆️

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[thinkerou]

duplicated #1450

[dengoswei]

cool..