What is 415 Error: Meaning and How to Fix Issue

What is 415 Error: Meaning and How to Fix Issue

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HTTP Status Code 415, also known as “Unsupported Media Type,” is a client error response code that indicates that the server is refusing to service the request because the payload (the data sent in the body of the request) is in a format that is not supported.

This can happen when the client sends a request to the server with a ‘Content-Type’ header that the server does not support, or the payload data is not in the format declared by that ‘Content-Type’ header. The ‘Content-Type’ header is used to specify the media type of the resource or the data being sent.

For example, let’s say a client tries to POST data to a server in JSON format, but the server is only set up to accept XML. In this case, the server would return a 415 status code because the media type of the payload (JSON) is not supported by the server (which is expecting XML).

It’s important to note that the 415 status code is often specific to the resource being accessed. So, it’s possible that a server could return a 415 error when trying to POST to one resource but not another if the other resource supports the media type being sent by the client.

The 415 status code is part of the HTTP/1.1 standard, and the appropriate reaction to receiving this code is generally to either correct the ‘Content-Type’ header or alter the payload to a format that the server can understand.

415 Status Codes (Unsupported Media Type) Impact on SEO

While HTTP 415 status codes (Unsupported Media Type) don’t directly impact SEO, they can indirectly affect your site’s SEO performance through user experience and technical performance.

User Experience (UX) One of the critical factors in SEO is providing a good user experience. When a user encounters a 415 error on your website, it creates a poor experience, leading to user dissatisfaction.
A user is likely to leave your site (bounce) if they encounter such an error, increasing your bounce rate. High bounce rates can signal to search engines that your website may not provide valuable content or a good user experience, which could negatively impact your search rankings.
Lost Link Equity If other websites are linking to a page on your site that returns a 415 error, this could lead to lost link equity. Inbound links (also known as backlinks) are a significant factor in how search engines rank your site.
When a page that has inbound links returns an error, the link equity (the SEO value of a hyperlink) that could have been passed to your site gets lost, potentially affecting your site’s authority and rankings.
Crawl Errors Search engines like Google use bots (also known as spiders or crawlers) to index the web. If these bots encounter a 415 error while trying to crawl your site, they cannot index the content on that page.
Pages that aren’t indexed won’t appear in search results, leading to reduced visibility.
Site Quality A high number of HTTP errors, including 415 status codes, can signal a low-quality site to search engines.
This perception can harm your overall SEO, as search engines may deem your site as less reliable or less user-friendly, affecting your site’s rankings.

While these factors don’t directly tie into the 415 status code itself, they are potential consequences of having pages that return this error on your site. Therefore, it’s essential to promptly identify and fix these issues to avoid possible SEO implications.

Common Issues That Can Lead to 415 Status

Dealing with HTTP status errors, like the 415 ‘Unsupported Media Type’ error, is part and parcel of website and SEO management. This error points to a mismatch in data format during client-server communication. Code errors and their solutions can include:

Incorrect Content-Type Headers

The server might return a 415 status code if the ‘Content-Type’ header in the request does not match the actual content sent in the body of the request.

The client must ensure that the 'Content-Type' header correctly identifies the media type of the resource being sent. This could involve modifying the application or script and making the request to include the correct 'Content-Type' header. For example, if you're sending JSON data, the 'Content-Type' header should be 'application/json'.

Unsupported Media Type

A server may return a 415 status code if it’s unable to process the payload sent by the client due to the server’s inability to handle that specific media type.

The client should confirm the media type that the server can accept and process. Once known, the client should convert the payload to the supported format before sending the request. It might also be necessary to configure the server to support more media types.

Inappropriate Payload Encoding

If the client sends a payload with an encoding that the server cannot process, the server might return a 415 error.

The client needs to ensure that the server supports the payload encoding being used. If it doesn't, the client should alter the encoding of the payload to a type that the server supports.

Once these errors are identified, the solutions above can be used to resolve the issue and prevent the 415 status code from appearing.

Finding a Fix For the HTTP 415 Error Code

Fixing the HTTP 415 ‘Unsupported Media Type’ error involves identifying the source of the problem and making the appropriate corrections. Here’s a general process you can follow:

Step 1: Confirm the Error

The first step is to confirm that the 415 error is indeed the issue. Use an HTTP status code checker to verify the status code.

Http Status Code Checker

Sitechecker.pro is an effective tool in detecting HTTP errors 415 ‘Unsupported Media Type’. Its crawler scans your entire website, identifying URLs that return this status code. After the scan, it provides a detailed report pinpointing where these issues reside, making it easier to address and rectify them.

Step 2: Identify the Source of the Error

Look at the specifics of the request that resulted in the error. If possible, check the server logs or use developer tools in your browser to examine the ‘Content-Type’ header and the payload of the failing request.

Step 3: Adjust the ‘Content-Type’ Header or Payload

If the ‘Content-Type’ header doesn’t match the actual payload being sent, you need to change one or the other so they’re consistent. For instance, if you’re sending JSON data, make sure your ‘Content-Type’ header is ‘application/json’.

Step 4: Check for Encoding Issues

If the server cannot process the encoding of the payload, you need to adjust the encoding to a type the server supports. Look at the ‘Content-Encoding’ header and the actual encoding of the data sent in the request.

Step 5: Test Your Changes

After making changes, you need to test the request again. If the changes were successful, you should no longer receive a 415 error. If the error persists, you may need to check with your server hosting provider or seek help from a web developer.

Remember, the key to fixing a 415 error is to ensure that the server supports the media type and encoding of the data being sent in the request. The client should only send data in a format and encoding that the server can process.


HTTP 415 Status Code, or ‘Unsupported Media Type’, occurs due to mismatched ‘Content-Type’ headers or unsupportable payload encoding. While it doesn’t directly influence SEO, its impact on user experience and technical performance can indirectly affect your SEO ranking. High bounce rates, lost link equity, crawl errors, and overall site quality can all suffer.

Tools like HTTP Status Code Checker can help identify and resolve these issues. Overall, ensuring the server can process the format and encoding of the data sent in the request is key to preventing HTTP 415 errors and optimizing your website’s performance.

Error code 415 in REST indicates 'Unsupported Media Type'. This is returned when the server can't process the media type of the request's payload.
A 415 status code in Axios, a promise-based HTTP client for JavaScript, means that the server couldn't process the request because the 'Content-Type' of the data being sent is not supported.
Error 415 in Rails, a web application framework written in Ruby, indicates that a request made to the server contains a payload in a format that the server cannot process or understand.
Error 415 in LoadRunner, a performance testing tool, indicates a situation where the test script sends data to the server in an unsupported format.
Fixing error 415 requires ensuring that the 'Content-Type' header correctly matches the format of the payload being sent, and that the server supports this format. Use a tool like Sitechecker.pro to identify and resolve these issues.
Error 400 is 'Bad Request', meaning the server couldn't understand the request due to invalid syntax. On the other hand, error 415 is 'Unsupported Media Type', indicating the server can't process the request's payload because of its format.
Error 406 is 'Not Acceptable', meaning the server cannot produce a response matching the list of acceptable values defined in the request's headers. Error 415 'Unsupported Media Type' occurs when the server can't process the request's payload due to its media type.
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