Скачать или смотреть Resolving the 401 Response Code for HttpURLConnection POST Requests with Custom Headers

Learn how to correctly set custom headers in your HttpURLConnection POST requests to avoid the `401 Unauthorized` response code.
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This video is based on the question https://stackoverflow.com/q/66462486/ asked by the user 'trilogy' ( https://stackoverflow.com/u/9278333/ ) and on the answer https://stackoverflow.com/a/66462629/ provided by the user 'rkosegi' ( https://stackoverflow.com/u/1121249/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting the 401 Unauthorized Response in HttpURLConnection POST Requests

If you've encountered the 401 Unauthorized error while trying to send a POST request with a HttpURLConnection in Java, you’re not alone. This error indicates that your request is missing proper authentication from the server side. Understanding how to set custom headers correctly is vital for successful communication with APIs. Below, we break down your situation and provide a clear solution to this common problem.

Understanding the Problem

You are attempting to connect to an API using a POST request and sending multiple custom headers, including an Authorization header. However, the server is responding with a 401 error code. This usually means the server did not recognize your credentials or that they were improperly formatted.

The Existing Code Overview

In your original code snippet, the Authorization header is set separately from the other custom headers. Here’s a brief look at the existing setup:

[[See Video to Reveal this Text or Code Snippet]]

The API documentation specifies the Authorization header with a specific format, which is being incorrectly segmented across multiple header calls.

The Correct Approach to Set Headers

To resolve the 401 Unauthorized error, you need to configure your Authorization header to include all necessary parameters in a single string. Here’s how you can correctly set the Authorization header according to the API documentation you provided:

Step-by-Step Solution

Combine Header Values: Instead of setting the Authorization header separately, concatenate all the required components into a single string.

Update the Code: Modify your original setting of headers as shown below.

Here’s the revised code snippet:

[[See Video to Reveal this Text or Code Snippet]]

Remove Individual Headers: You may choose to maintain the other headers separately if they are necessary for your API request, but ensure the Authorization header is correctly formatted.

Key Changes to Note

Single Header for Authorization: This change includes all elements in a single Authorization header, making it recognizable by the server.

Quoting Key Values: Be mindful to use double quotes around values like key, as specified in the documentation.

Conclusion

When integrating with APIs, ensuring your authentication headers are correctly formatted is crucial. By combining all necessary information into a single Authorization header, you can mitigate issues like 401 Unauthorized responses. This approach not only simplifies your header management but also adheres to the API requirements.

Feel free to reach out if any additional support is needed or if you have more questions about API integrations with Java!