Different situation#15

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godblesshugh wants to merge 3 commits intoajg:masterfrom

godblesshugh:master

Commits on Jul 14, 2017

Different situation:
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Commits on Jul 17, 2017

默认用 form 做标签，没有 form 的时候用 json 标签做申明
 godblesshugh
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Commits on Jul 18, 2017

using form as default tag, json will be used when there's no form tag.
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