I've seen a couple questions around here like How to debug RESTful services , which mentions:
Unfortunately that same browser won't allow me to test HTTP PUT, DELETE, and to a certain degree even HTTP POST.
I've also heard this, that browsers support only GET and POST, from some other sources like:
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http://www.packetizer.com/ws/rest.html
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http://www.mail-archive.com/jmeter-user@jakarta.apache.org/msg13518.html
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http://www.xml.com/cs/user/view/cs_msg/1098
However, a few quick tests in Firefox show that sending PUT and DELETE requests works as expected -- the XMLHttpRequest completes successfully, and the request shows up in the server logs with the right method. Is there some aspect to this I'm missing, such as cross-browser compatibility or non-obvious limitations?
Source: Tips4all, CCNA FINAL EXAM
HTML forms (up to HTML version 4 and XHTML 1) only support GET and POST as HTTP request methods. A workaround for this is to tunnel other methods through POST by using a hidden form field which is read by the server and the request dispatched accordingly.
ReplyDeleteHowever, for the vast majority of RESTful web services GET, POST, PUT and DELETE should be sufficient. All these methods are supported by the implementations of XMLHttpRequest in all the major web browsers (IE, Firefox, Opera).
Read an in-depth analysis here: HTTP methods, Web browsers and XMLHttpRequest
ReplyDeleteHe tested various HTTP Methods with Ajax calls from Fx, Opera and IE.
HTML forms support GET and POST. (HTML5 at one point added PUT/DELETE, but those were dropped.)
ReplyDeleteXMLHttpRequest supports every method, including CHICKEN, though some method names are matched against case-insensitively (methods are case-sensitive per HTTP) and some method names are not supported at all for security reasons (e.g. CONNECT).
Browsers are slowly converging on the rules specified by XMLHttpRequest, but as the other comment pointed out there are still some differences.
XMLHttpRequest is a standard object in the JavaScript Object model.
ReplyDeleteIt first appeared in Internet Explorer 5 as an ActiveX object, but has since been made into a standard and has been included for use in JavaScript in the Mozilla family since 1.0, Apple Safari 1.2, Opera 8.0, and IE 7.0.
The open() method on the object takes the HTTP Method as an argument - and is specified as taking any valid HTTP method - including GET, POST, HEAD, PUT and DELETE
Just to add - Safari 2 and earlier definitely didn't support PUT and DELETE. I get the impression 3 did, but I don't have it around to test anymore. Safari 4 definitely does support PUT and DELETE.
ReplyDeleteI believe those comments refer specifically to the browsers, i.e., clicking links and submitting forms, not XMLHttpRequest. XMLHttpRequest is just a custom client that you wrote in JavaScript that uses the browser as a runtime.
ReplyDeleteUPDATE: To clarify, I did not mean (though I did write) that you wrote XMLHttpRequest; I meant that you wrote the code that uses XMLHttpRequest. The browsers do not natively support XMLHttpRequest. XMLHttpRequest comes from the JavaScript runtime, which may be hosted by a browser, although it isn't required to be (see Rhino). That's why people say browsers don't support PUT and DELETE—because it's actually JavaScript that is supporting them.