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        XMLHttpRequest 的 getResponseHeader() 的限制?

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                • 本文介绍了XMLHttpRequest 的 getResponseHeader() 的限制?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!


                  我注意到 XMLHttpRequest.getResponseHeader() 的结果并不总是与返回的真实标头匹配(如果请求是以常规方式发出的).

                  I've noticed that the results of and XMLHttpRequest.getResponseHeader() don't always match the real headers returned (if the request is made in a regular manner).

                  例如,假设我正在为 https://foo.example.com/api/resource/100 发出 xhr 请求.在 Chrome 的开发者控制台中,在网络"下,我可以看到正在做出的响应——我还可以看到所有响应标头(比如 10).但是(复制粘贴控制台):

                  For example, assume I'm making an xhr request for https://foo.example.com/api/resource/100. In Chrome's developer console, under 'Network', I can see the response being made -- I can also see all of the response headers (say, 10). However (copy-pasted console):

                  > response
                  > response.getAllResponseHeaders();
                    "content-type: text/html

                  对可用的标头有任何限制吗?这取决于响应类型吗?我记得有一套完整的 404 标头,但只有这个 400 的标头.

                  Are there any restrictions on what headers are available? Is this dependent on the response type? I remember getting a complete set of headers for 404s but just this one for 400s.



                  XMLHttpRequest 的标准化现状API 仅限制对 Set-CookieSet-Cookie2 标头字段的访问:

                  The current state of standardizing the XMLHttpRequest API does only restrict the access to the Set-Cookie and Set-Cookie2 header fields:



                  返回响应中的所有标头,字段名称为 Set-CookieSet-Cookie2 的标头除外.

                  Returns all headers from the response, with the exception of those whose field name is Set-Cookie or Set-Cookie2.


                  Any other header field should be returned.

                  但是当你做一个跨域请求时,浏览器需要实现 XMLHttpRequest Level 2 因为原来的 XMLHttpRequest 只允许同源请求:

                  But as you’re doing a cross-origin request, the browser needs to implement XMLHttpRequest Level 2 as the original XMLHttpRequest does only allow same-origin requests:

                  XMLHttpRequest Level 2 规范增强了 XMLHttpRequest 对象的新特性,例如跨域请求 […]

                  The XMLHttpRequest Level 2 specification enhances the XMLHttpRequest object with new features, such as cross-origin requests […]

                  在那里你可以读到跨源资源共享规范过滤了那些过滤由 getResponseHeader() 公开的标头,用于非 same-origin 请求.".并且该规范禁止访问除 简单响应头字段(即Cache-ControlContent-LanguageContent-TypeExpiresLast-ModifiedPragma):

                  There you can read that the "Cross-Origin Resource Sharing specification filters the headers that filters the headers that are exposed by getResponseHeader() for non same-origin requests.". And that specification forbids access to any response header field other except the simple response header fields (i.e. Cache-Control, Content-Language, Content-Type, Expires, Last-Modified, and Pragma):

                  用户代理必须过滤掉除简单响应头之外的所有响应头 […]

                  User agents must filter out all response headers other than those that are a simple response header […]

                  例如因此,XMLHttpRequest 的 getResponseHeader() 方法不会暴露上面未指明的任何标头.

                  E.g. the getResponseHeader() method of XMLHttpRequest will therefore not expose any header not indicated above.

                  这篇关于XMLHttpRequest 的 getResponseHeader() 的限制?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持html5模板网!

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