What happens when no response is received for a request? I’m seeing retries

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Checkout this blog post that explains what is happening:
http://geek.starbean.net/?p=393

According to HTTP/1.1 RFC 8.2.4:

If an HTTP/1.1 client sends a request which includes a request body, but which does not include an Expect request-header field with the “100-continue” expectation, and if the client is not directly connected to an HTTP/1.1 origin server, and if the client sees the connection close before receiving any status from the server, the client SHOULD retry the request.

Make sure you design your web app to tolerate these extra requests. And if you want the ajax request to do something only once, such as writing something to a database, then you need to design the request as idempotent. See: What is an idempotent operation?

Also, this highlights the differences between GET and POST operations:
http://www.cs.tut.fi/~jkorpela/forms/methods.html

As a general design practice:
-GET operations should be designed as idempotent
-POST operations should be used for writing to databases, etc.

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