Upgrade to version 3.0.0, test the Put Method in swagger-ui.html , occured 400 BAD_REQUEST #3492

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• What version of the library are you using? Is it the latest version?
  version 3.0.0

What kind of issue is this?

• Question. Is this a question about how to do a certain thing?

1. test Put method interface accored 400 error BAD_REQUEST
2. use the fiddler and postman test it that is ok.
3. version rollback to v2.9.2 it's ok.

• Bug report. If you’ve found a bug, spend the time to write a failing test.
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result: