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    What Is 505 HTTP Version Not Supported?

    By 2 Mins Read

    The 505 HTTP version not supported is a server error status code showing that the server doesn’t understand or support the HTTP protocol version used in the client’s request. When you encounter a 505 status code, it means there’s a mismatch between the HTTP version your client is using and what the server can handle. 

    This error is different from a 505 service unavailable error, as it specifically relates to protocol version incompatibility rather than server availability issues.

    What Causes the 505 HTTP Version Not Supported?

    Several factors can trigger a 505 HTTP error. The most common cause is when clients use outdated or unsupported HTTP protocols that the server doesn’t recognize. This often happens when:

    • Your browser or client application is using an obsolete HTTP version
    • The server is configured to reject certain HTTP versions for security reasons
    • Proxy servers or load balancers between the client and server modify the HTTP version inappropriately
    • Server software is misconfigured or needs updating
    • Network security devices block specific HTTP versions

    Example

    Request:

    GET /api/resource HTTP/9.9

Host: example.com

Accept: application/json

User-Agent: CustomClient/1.0

    Response:

    HTTP/1.1 HTTP 505 Version Not Supported

Content-Type: text/html

Content-Length: 126

<!DOCTYPE html>

<html>

<header>

    <title>HTTP 505 Version is Not Supported</title>

</header>

<body>

    <h1> HTTP 505 Version is Not Supported</h1>

    <p>The server doesn’t support the specified HTTP protocol version in the request.</p>

</body>

</html>

    In this example, the client attempts to use a non-existent HTTP version (9.9), causing the server to respond with a 505 status code. The server only supports standard HTTP versions like 1.0, 1.1, or 2.0, making it impossible to process the request with the specified version.

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