Add a redirect sample for POST method

[MilesLin]

Refer to issue #444

• With pull requests:
  • Open your pull request against master
  • Your pull request should have no more than two commits, if not you should squash them.
  • It should pass all tests in the available continuous integration systems such as TravisCI.
  • You should add/modify tests to cover your proposed code changes.
  • If your pull request contains a new feature, please document it on the README.

[codecov]

Codecov Report

Merging #2389 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2389   +/-   ##
=======================================
  Coverage   98.63%   98.63%           
=======================================
  Files          41       41           
  Lines        2348     2348           
=======================================
  Hits         2316     2316           
  Misses         18       18           
  Partials       14       14           

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