Question

客户发出一份POST或PUT申请,其中包括负责人:

Expect: 100-continue

服务器根据状况代码:

100 Continue

客户现在寄出什么? 它是否发出整个要求(以前发出的要求线和头盔,以及原先的NOT发送的内容)? 还是仅仅发送内容?

我认为这 s了,但我为在线找到具体的例子而努力。感谢。

Answer 1

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In my experienced this is really used when you have a large request body. It could be considered to be roughly complementary to the HEAD method in relation to GET requests - fetch just the header information and not the body (usually) to reduce network load. 100 responses are used to determine whether the server will accept the request based purely on the headers - so that, for example, if you try and send a large POST/PUT request to a non-existent server resource it will result in a 404 before the entire request body has been sent.

So the short answer to your question is - yes, it s the latter. Although, you should always read the RFC for a complete picture. RFC2616 contains 99% of the information you would ever need to know about HTTP - there are some more recent RFCs that settle some ambiguities and offer a few small extensions to the protocol but off the top of my head I can t remember what they are.

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