409 Conflict
When the server responds with the HTTP status code 409 Conflict, it means that the client’s request cannot be fulfilled because it conflicts with the current state of the resource.
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Introduction
In Action
Sample
Conclusion
Introduction
When the server responds with the HTTP status code 409 Conflict, it means that the client’s request cannot be fulfilled because it conflicts with the current state of the resource.
The server provides information in the response message to help the client resolve the conflict and make a valid request.
This status code is often used in situations where multiple clients are trying to access and modify the same resource simultaneously.
In Action
When you encounter the 409 Conflict error message, it means that your request is valid, but there is an issue with the current state of the resource.
For instance, if you are trying to reply to a post that has been deleted, the server may return this status because the post is no longer available for replying.
To resolve the conflict, you should check the message body provided by the server, which may offer suggestions on how to proceed.
In the case of a deleted post, you might choose to abandon the reply, undelete the post if possible, or create a new post with the content quoted from the original. The decision on how to handle the conflict lies with you, following any guidelines set by the server.
Sample
In the example, the client tries to give a “like” to an existing blog post with ID 111. However, the server’s response indicates that the post is frozen, and it cannot accept any new likes or tags.
Request
POST /blog/update?postid=111&flag=like HTTP/1.1
Host: www.example.com
Response
HTTP/1.1 409 Conflict
Content-Type: text/html
Content-Length: 288
< html>
< head>
< title>Blog Entry Frozen< /title>
< /head>
< body>
< p>This post has been marked read-only. To post a reply or tag it, please change the status and try again.< /p>
< /body>
< /html>
Conclusion
The 409 Conflict status code indicates that there is a mismatch or inconsistency between the client’s request and the current state of the resource on the server. When receiving this error, the client should examine the server’s response in the message body to understand the nature of the conflict and take appropriate actions to resolve it.
