add gClient ExampleNew function

[huangqian1985]

Issue URL: #1822

Document URL：https://goframe.org/pages/viewpage.action?pageId=1114381#HTTPClient%E5%9F%BA%E6%9C%AC%E4%BD%BF%E7%94%A8-New%E6%96%B9%E6%B3%95%E7%9A%84%E4%BD%BF%E7%94%A8

[codecov-commenter]

Codecov Report

Merging #1823 (f82f53f) into master (6dccaf8) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1823      +/-   ##
==========================================
- Coverage   73.46%   73.45%   -0.01%     
==========================================
  Files         494      494              
  Lines       44175    44174       -1     
==========================================
- Hits        32452    32450       -2     
  Misses       9769     9769              
- Partials     1954     1955       +1     

Flag	Coverage Δ
go-1.15	73.41% <0.00%> (-0.01%)	⬇️
go-1.16	73.41% <0.00%> (+0.02%)	⬆️
go-1.17	73.42% <0.00%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
net/gclient/gclient_response.go	72.22% <0.00%> (-3.46%)	⬇️

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[gqcn]

此外，如果Close后归还链接对象如果没有更好方案可以在Close中调用ReadAll。

[huangqian1985]

此外，如果Close后归还链接对象如果没有更好方案可以在Close中调用ReadAll。

OK 我晚上加下