WEBAPI series ~stringcontent parameters need to add Metatype object

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For API calls have been many see, in the client to post a request to the API server is also often seen, but sometimes not notice, may cause some problems, such as the assignment of a httpcontent parameter, if you use stringcontent this derived class, You need to show the mediatype, or the request will be 415 error.

After finding some information, also calculate the result, is for httpclient, specify its mediatype can

After the test, the data can reach the address of the POST request normally.

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WEBAPI series ~stringcontent parameters need to add Metatype object