I can't find a precise answer on that question :
Are parameters which are sent by PUT passed in the URL, or in the HTTP header ?
I think it's the HTTP header, but when I submit my form with the PUT method, it appends the parameters to the URL !
Are parameters which are sent by PUT passed in the URL, or in the HTTP header ?
Not the headers. It's the same as POST - either the URL or the body of the request. The only difference is the HTTP verb being used and of course the semantics that come with it (UPDATE a resource on the server).
Your question seems to be about HTML forms. In which case the answer is: they do not support PUT (the browser still sends a POST request instead).
If it's not about HTML forms: it's up to you. For instance, in XmlHttpRequest you can use both.
来源：https://stackoverflow.com/questions/12578513/how-are-put-parameters-passed-to-a-page