What is a HTTP 415 Status Code (Unsupported Media Type)?

Reliqus Marketing

01 May 2024

HTTP Status Codes
By Ankit Bhatia
Founder & CEO

Are you one of the many who are unfamiliar with the HTTP 415 status code? You’re not alone. These numerical codes can be daunting, especially for those not well-versed in web development or server protocols. 

But don’t be overwhelmed, because in this blog post, we will simplify the meaning and significance of the 415 status code. We understand how frustrating and confusing it can be to encounter an error message, so let’s dive in and demystify the HTTP 415 error together in a way that’s easy to grasp.

What Exactly is a HTTP 415 Status Code?

A 415 Status Code, often seen as “415 Unsupported Media Type Error” occurs when a web server refuses to accept the request because the payload format is unsupported.

Imagine trying to insert a key into a lock that doesn’t fit. Similarly, when you or an application attempts to communicate with a server using a media type (like an image, video, or document format) that the server doesn’t understand or support, it responds with a 415 HTTP Response Status Code.

The server says, “I recognize your request, but I can’t process it in this form.” This error highlights the importance of compatibility between what’s being sent and what the server is equipped to handle.

415 UNSUPPORTED MEDIA TYPE Source: RFC7231 Section 6.5.13

415 Code References

Rails HTTP Status Symbol :unsupported_media_type

Go HTTP Status Constant http.StatusUnsupportedMediaType

Symfony HTTP Status Constant Response::HTTP_UNSUPPORTED_MEDIA_TYPE

Python2 HTTP Status Constant httplib.UNSUPPORTED_MEDIA_TYPE

Python3+ HTTP Status Constant http.client.UNSUPPORTED_MEDIA_TYPE

Python3.5+ HTTP Status Constant http.HTTPStatus.UNSUPPORTED_MEDIA_TYPE

Why Does the 415 Status Code Happen?

When you come across a HTTP 415 status code, it signifies that the server has declined to process a request from your browser. This refusal is typically because the payload—the data sent to the server—is not in a format that the server can recognize or is willing to accept.

More often than not, this error occurs from the Content-Type or Content-Encoding headers in a format the server rejects. This error is widespread when the server inspects the message body and discovers it cannot accept the file type because it doesn’t support the payload.

The server is programmed to work with specific data types, and anything outside of that set can lead to a 415 error. It’s also worth noting that this error can indicate an issue within the PHP code of your application, where the specified content type may not be correctly configured or supported.

HTTP 415 Status Code Example

Let’s bring the HTTP 415 error code to life with an example. Imagine you’re trying to request a gif file from a server, but the server only accepts PNG files. That’s when you’ll encounter the 415 error code.

Initial request

POST /blog/ HTTP/1.1

Host: www.example.com

Content-Type: gif

Content-Length: 15

Initial response

HTTP/1.1 415 Unsupported Media Type

Content-Type: text

Content-Length: 130



<title> Unsupported format </title>



<p> This media type is not supported </p>



Common Issues That Can Lead to 415 Unsupported Media Type Error

Incorrect Content-Type Headers: When a request is sent to the server, it includes headers that inform the server about the type of content being sent. If the Content-Type header is incorrect or mismatches the actual content type of the payload, the server may not recognize the format and return a 415 error. It’s akin to labelling a sugar jar as salt; the label guides expectations no matter what’s inside. 

Unsupported Media Type: Each server is configured to support certain media types, such as images in JPEG format, text in HTML, or data in JSON. If you attempt to send data in a format the server does not support, it will not be able to process your request. This is similar to trying to play a Blu-ray disc in a DVD player; the technology doesn’t match up.

Inappropriate Payload Encoding: How data is encoded when transmitted can also lead to a 415 error. If the server does not support the encoding of the payload or is not correctly identified in the request, the server may refuse to process it. Imagine sending a message in Morse code to someone who can only read Braille. The message is there, but the recipient lacks the means to understand it.

While we’re discussing various HTTP status errors, understanding other related issues can also be beneficial. For example, the HTTP 414 status code occurs when the URL requested by the client is too long for the server to handle. Learn more about how this relates to overall server request handling in my detailed guide on What Is HTTP 414 Status Code?

How to Fix a 415 Status Code Error?

Fixing a HTTP 415 status code error typically requires some coding experience. Here are a few steps you can take to address this issue:

  • Ensure that the request being sent includes the appropriate Content-Type header. This header should match the media type of the data you’re attempting to upload or submit. 
  • Make sure that the server you’re interacting with is configured to accept and process the specific Content-Type header you’re sending. 
  • Use the Accept Header for Double Checking what your server can process

If you do not have coding experience or are unsure how to proceed with these steps, consulting a professional service like Reliqus Consulting can be a great option. We have the expertise to diagnose and resolve such errors, ensuring your requests are correctly understood and processed by servers.

Which HTTP Method is used with 415 HTTP Status Code?

Navigating through the complexities of the 415 HTTP Status Code, it’s essential to understand the various HTTP methods that can be associated with this error. These methods include:

Each method serves a distinct purpose in the world of web communication. 

The GET method, for instance, is used to retrieve a representation of a specific resource. It’s designed with the intention that making a request using GET should only return data and have no other effect. 

The DELETE method, as the name implies, removes a specified resource from the system. When successful, it’s a direct action that deletes the targeted resource and alters the server’s state.

Lastly, the POST method is employed to submit an entity to the specified resource, often resulting in a change in the server’s state or other consequential side effects. This method is fundamental for creating new resources or submitting data for processing to an existing resource.

What are the Related HTTP Response Headers with 415 HTTP Status Code?

Navigating the world of HTTP status codes can sometimes feel overwhelming, but understanding the nuances can be empowering. In relation to the 415 HTTP Status Code, certain HTTP Response Headers play a crucial role in both the occurrence of this error and its resolution. 

Here’s how they intertwine:

– The Content-Type HTTP Header is crucial as it indicates the resource’s original media type before any content encoding for transmission occurs. This tells the server what type of file or data is being sent.

– The Content-Encoding HTTP Header is essential for reducing the media size for more efficient transmission. When the server receives this header, it understands which encoding has been used and whether it can decode it.

– The Accept HTTP Header plays a pivotal role from the client’s end. It communicates the content types the client is equipped to understand, stating its preferences or capabilities regarding data processing.

HTTP 415 Status Codes (Unsupported Media Type) Impact on SEO

Understanding the impact of a 415 Status Code on your website’s SEO can be crucial, as it goes beyond a simple error message. It touches the core of user experience and your website’s relationship with search engines. 

Here’s how:

  • User Experience (UX): A 415 error can frustrate users who encounter it, potentially leading them to leave your site searching for one that works correctly. This negative experience can decrease their likelihood of returning, impacting your site’s engagement metrics and, indirectly, its SEO performance.
  • Lost Link Equity: If other websites link to content that returns a 415 error, this can result in lost link equity. Search engines like Google value links pointing to your content, but if those links lead to errors, it diminishes the value passed through them, potentially affecting your site’s ranking.
  • Crawl Errors: Search engines crawl your website to index content. Encountering a 415 error can halt or slow down this process, leading to crawl errors. This means that new or updated content may take longer to appear in search results.
  • Site Quality: Frequent 415 errors can indicate poor site quality to search engines. A well-maintained site shouldn’t regularly return such errors. High error rates may lead search engines to downgrade your site’s rankings, perceiving it as less reliable or lower quality.

Will Search Engines Index a URL with a 415 Unsupported Media Type Status Code?

When it comes to search engines like Google, it’s essential to understand that they will not index URLs that return a 415 error. This is crucial because web pages experiencing a 415 Unsupported Media Type status code could significantly lose their rankings within search results. It’s vital to be aware of this consequence, as it directly impacts the visibility of your content online.


In wrapping up, the HTTP 415 error, with its unique and intricate nature, presents a challenge that often requires a developer’s touch to properly address. This error, deeply rooted in compatibility issues between the server and the media type of the content being requested, can seem daunting at first glance. A practical starting point for those looking to troubleshoot on their own is to meticulously check the Content-Type header values in the request for any potential typos or mismatches. This simple step can resolve the issue without the need for deeper intervention.

If the problem persists or if you find yourself lacking the necessary technical expertise, remember that Reliqus Consulting is always prepared to lend a hand. Our extensive experience in navigating website and server issues can be the key to resolving not only HTTP 415 errors but a wide range of technical challenges.

Moreover, our comprehensive HTTP Status Code guide is not just a resource, but an invaluable tool for those interested in expanding their knowledge of HTTP status codes and understanding more about what each code signifies. It delves into various errors, offering insights and solutions that empower developers and website owners alike.


Understanding the nuances of various error codes can be overwhelming, but we’re here to break them down for you with warmth and clarity. 

How to Use 415 HTTP Status Codes for a Website?

Implement the 415 Status Code on a website by configuring the server to return this status code when it receives a POST request with a Content-Type of application/x-www-form-text that it does not support.

How to Check HTTP 415 Status Code?

Verify a 415 HTTP Status Code by utilizing the network tab in your browser’s developer tools to inspect the responses for each resource request made by the client.

What is the Browser’s Compatibility with 415 Status Codes?

Most modern browsers, including Chrome, Firefox, Edge, Internet Explorer, Opera, Safari, and Samsung Internet, support the 415 HTTP status code.

What is REST error code 415?

415 Unsupported Media Type is a REST error code that indicates that the server refuses to accept the request because the payload format is unsupported.

What is Status Code 415 in Axios?

A 415 status code in Axios, a promise-based HTTP client for JavaScript, signifies that the server cannot handle the request’s media type. This is typically due to the `Content-Type` header being set to a format the server does not support or is incorrectly defined.

What is Error 415 in Rails?

 Error 415 in Rails, a web application framework written in Ruby, means that the request contained a media type that the server or the resource does not support. It’s a hint to check if the content type of the sent data matches what the server expects.

What is Error 415 in LoadRunner?

Error 415 in LoadRunner, a performance testing tool, occurs when a virtual user script sends a request with an unsupported media type. It suggests reviewing the content type specified in the script to match the one the server accepts.

What is the Difference Between Error 400 and 415?

Error 400 indicates a bad request, while error 415 indicates an unsupported media type.

What is the Difference Between 406 and 415 error codes?

Error 406 indicates that the server cannot find any acceptable response, while error 415 indicates that the server refuses to accept the request because the payload format is unsupported.

Ankit Bhatia

Founder & CEO at Reliqus

With 12+ years of experience building a web presence for 300+ businesses, Ankit understands how businesses can use technology to increase revenue.

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