502 Bad Gateway
The 502 HTTP response status code means that the server, acting as a gateway or proxy, received an invalid response from another server it was trying to connect to.
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Introduction
In Action
Sample
Conclusion
Introduction
When you encounter the 502 Bad Gateway HTTP status code, it means that the server, acting as a gateway or proxy, received an invalid response from another server it was trying to connect to.
This error usually occurs when there is a problem with the upstream server, causing it to provide an improper or incomplete response, resulting in the 502 error being returned to you as a client.
In Action
When you encounter the 502 Bad Gateway status code, it means the server, acting as a middleman, encountered an issue while trying to fetch information from another server.
This could be due to a problem with the upstream server, resulting in an invalid response. The time to resolve this issue cannot be predicted, and it’s important for the server to return the most accurate error description to help clients understand the problem.
If no response is received from the upstream server at all, a 504 Gateway Timeout status code is more appropriate. It’s crucial to handle these errors properly to avoid negative effects on search rankings and user experience.
Sample
In the example, when the client requests a resource, the server acts as an intermediary and tries to fetch the resource from another server.
However, the other server returns an invalid response. As a result, the server sends back a 502 Bad Gateway status code to indicate the issue, and the client is unable to access the requested resource.
Request
GET /news HTTP/1.1
Host: www.example.com
Response
HTTP/1.1 502 Bad Gateway
Content-Type: text/html; charset=UTF-8
Content-Length: 134
< html>
< head>
< title>Bad Gateway< \title>
< /head>
< body>
< p>The server is unreachable at this time.< /p>
< /body>
< /html>
Conclusion
The 502 Bad Gateway status code is like a “proxy error” that occurs when the server, acting as a gateway or intermediary, receives an invalid response from another server while trying to fulfill the client’s request. This error indicates a problem with the communication between servers and may prevent the client from accessing the desired resource.
