The HTTP 409 Conflict response status code indicates a request conflict with current state of the target resource. Conflicts are most likely to occur in response to a PUT request.
What is the value of the header expect ‘?
100-continue
The HTTP headers Expect request-header field is used to indicate specific behaviors or expectations that the server needs to fulfill in order to respond to the client. Generally, Expect: 100-continue is the only expectation defined for the header field.
What does 100 Continue mean?
The HTTP 100 Continue informational status response code indicates that everything so far is OK and that the client should continue with the request or ignore it if it is already finished.
Why do we get 409 error?
What can cause 400 Bad Request?
Check for errors in the URL. The most common reason for a 400 Bad Request error is because the URL was typed wrong or the link that was clicked on points to a malformed URL with a specific kind of mistake in it, like a syntax problem. This is most likely the problem if you get a 400 Bad Request error.
