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教学小论文：作业布置浅谈
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正在加载中，请稍后...How to respond to an HTTP OPTIONS request? - Stack Overflow
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J it only takes a minute:
The HTTP OPTIONS method is supposedly used to determine what other methods the server supports on a given resource.
Given that, I have two questions:
What does this response look like?
I have seen examples with CSV lists in Public, Allow, and even Access-Control-Allow-Methods headers.
Are they all needed?
What's the difference?
doesn't seem to be very helpful here.
Would it be appropriate to use this to list the actions that a resource supports in a non-REST-API environment?
For example, if my ConversionController supports the action convert, would a response like this make sense:
OPTIONS /conversion HTTP/1.1
HTTP/1.1 200 OK
Allow: CONVERT
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RFC 2616 defines "Allow" (). "Public" is not in use anymore. "Access-Control-Allow-Methods" is defined in the CORS specification (see ).
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In response to the title: "How to respond to an HTTP OPTIONS request?"
To answer that, I'd want to know why you want to respond to an OPTIONS request?
Who/what is sending you an OPTIONS request, and why?
(500, 501, 405).
So, unless you're in a specific situation where your clients will be reasonably sending OPTIONS requests and expecting useful/meaningful information back (e.g., WebDAV, CORS), you probably want to respond with: "don't do that."
In terms of your question about the "OPTIONS /conversion HTTP/1.1" request:
unless you know that there's some client of your server, a client which would send an OPTIONS request to "/conversion" and expect a response with "Allow: CONVERT," the answer is no: it wouldn't make sense to respond like that.
I think that most implementations that do support OPTIONS and respond with "Allow," respond with standard HTTP methods.
OPTIONS is immediately problematic because it doesn't support caching.
Alternatives:
server-wide metadata: try .
Resource-specific: try using a
on its responses, or a link in the representation format for that resource.
Lastly, if what you're after is a service description, have a look at
dotnetguy makes a good point in the comment below: OPTIONS is undeniably valuable in certain contexts (e.g., CORS); I certainly didn't mean to suggest otherwise.
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