feat: cache

[atian25]

Checklist

• npm test passes
• tests and/or benchmarks are included
• documentation is changed or added
• commit message follows commit guidelines

Affected core subsystem(s)

Description of change

[codecov]

Codecov Report

Merging #7 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master        #7   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         6    +1     
  Lines           88       118   +30     
=========================================
+ Hits            88       118   +30     

Impacted Files	Coverage Δ
app/extend/application.js	100.00% <100.00%> (ø)
app/extend/context.js	100.00% <100.00%> (ø)
config/config.default.js	100.00% <100.00%> (ø)
lib/cache_manager.js	100.00% <100.00%> (ø)
lib/http_proxy.js	100.00% <100.00%> (ø)

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[DuanPengfei]

LGTM;

[killagu]

cache 处理遵守 http cache 规则会比较好，防止脏缓存出现。还可以加个 hook 由上层来决定缓存是否可使用。

[DuanPengfei]

@killagu http cache 规则是指遵循 etag 这种吗？

[killagu]

是的