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I just want to make sure which browsers send the Expect: 100-Continue header? So that until the server responds with a 100 Continue HTTP status, no data should be sent.

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This is unclear. Could you elaborate? – Itai Mar 2 at 2:14
@Itai, There is special header in HTTP called Expect 100 Continue. When a browser send this header until server returns 100 continue, client will not send any data to server – user960567 Mar 2 at 8:00
Just to clarify... the browser sends an Expect: header with a value of 100-Continue, the server then responds with an HTTP status code of 100 Continue if applicable. I don't think any browser sends this header automatically, this is down to your code - IMHO. – w3d Mar 2 at 18:00

closed as not a real question by Stephen Ostermiller, Anagio, Su', bybe, John Conde♦ Mar 9 at 16:27

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, see the FAQ.