Why Am I Getting a 415 \'Unsupported Media Type\' Error for My JSON Requests?

Resolving HTTP 415 Unsupported Media Type Error for JSON Requests

When issuing a REST request with a JSON body, it is not uncommon to encounter an HTTP 415 "Unsupported Media Type" error. This error typically originates from the server when it is unable to process the incoming JSON data.

Specifically, the issue raised in the question is characterized by a POST request with a properly defined "Content-Type: application/json" header but still receiving the "Unsupported Media Type" error. Despite trying various JSON libraries, the problem persisted.

Solution: Omitting Charset Specification

After careful examination, it was discovered that the inclusion of the "charset=utf8" parameter in the "Content-Type" header was the culprit of the error. By removing "charset=utf8" from the request header, the error miraculously vanishes.

Revised Code:

<code class="java">con.setRequestProperty("Content-Type", "application/json");
con.setRequestProperty("Accept", "application/json");</code>

Technical Explanation:

It appears that omitting the "charset=utf8" parameter allows the server to automatically detect the encoding of the incoming JSON data. This is often the preferred approach, as the encoding should be transparent to the application layer and handled by underlying communication mechanisms.

Conclusion:

In certain scenarios, it is possible to resolve the HTTP 415 "Unsupported Media Type" error for JSON requests by eliminating the charset specification from the "Content-Type" header. This simple modification enables the server to seamlessly process the incoming JSON data, leading to successful REST service interactions.

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