HTTP 415 Unsupported Media Type vs 505 HTTP Version Not Supported
HTTP 415 (Unsupported Media Type) is a 4xx Client Error response, while 505 (HTTP Version Not Supported) is a 5xx Server Error response. 415 indicates that the server refuses to accept the request because the Content-Type is not supported. In contrast, 505 means that the server does not support the HTTP version used in the request.
Description
The server refuses to accept the request because the Content-Type is not supported.
When You See It
When sending JSON to an endpoint that only accepts XML, or missing the Content-Type header.
How to Fix
Set the correct Content-Type header matching the data format you're sending.
Description
The server does not support the HTTP version used in the request.
When You See It
When a client uses an HTTP version the server doesn't support.
How to Fix
Use a supported HTTP version (typically HTTP/1.1 or HTTP/2).
Key Differences
415 is a 4xx Client Error response, while 505 is a 5xx Server Error response.
HTTP 415: The server refuses to accept the request because the Content-Type is not supported.
HTTP 505: The server does not support the HTTP version used in the request.
You encounter 415 when when sending JSON to an endpoint that only accepts XML, or missing the Content-Type header.
You encounter 505 when when a client uses an HTTP version the server doesn't support.
When to Use Which
For 415 (Unsupported Media Type): Set the correct Content-Type header matching the data format you're sending. For 505 (HTTP Version Not Supported): Use a supported HTTP version (typically HTTP/1.1 or HTTP/2).