如何使用访问控制允许来源?它只是在html头标签之间吗?-前端问题

How do I use Access-Control-Allow-Origin? Does it just go in between the html head tags?(如何使用访问控制允许来源?它只是在html头标签之间吗?)

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问题描述

我一直在阅读有关 Access-Control-Allow-Origin 的内容，因为它似乎可以有效地允许跨域请求，因为我可以访问外部站点.我的问题是如何使用 Access-Control-Allow-Origin 来允许跨域请求.我试过这个(别笑)(顺便说一句，我想要一个数字，返回 1 或 0)

I've been reading about Access-Control-Allow-Origin because it seems effective at allowing cross domain requests since I have access to the external site. My question ism how do I use Access-Control-Allow-Origin to allow cross domain requests. I tried this (don't laugh) (by the way all I want is for a single number, 1 or 0 to be returned)

<html>
<head>
Access-Control-Allow-Origin: *
</head>
<body>
1
</body>
</html>

我接近了吗?谢谢你的帮助.如果有更简单的方法来执行简单的跨域请求，请告诉我.

Am I close? Thanks for your help. If there is an easier way to do a simple cross-domain request let me know.

推荐答案

这是一个HTTP头.您将配置您的网络服务器或网络应用程序以理想地发送此标头.也许在 htaccess 或 PHP 中.

That is an HTTP header. You would configure your webserver or webapp to send this header ideally. Perhaps in htaccess or PHP.

~~或者你也可以使用~~

~~Alternatively you might be able to use~~

~~<head>...<meta http-equiv="Access-Control-Allow-Origin" content="*">...</head>~~

~~我不知道这是否可行.并非所有 HTTP 标头都可以直接在 HTML 中配置.~~

~~I do not know if that would work. Not all HTTP headers can be configured directly in the HTML.~~

这可以替代许多 HTTP 标头，但请参阅下面的 @EricLaw 的评论.这个特定的标头是不同的.

This works as an alternative to many HTTP headers, but see @EricLaw's comment below. This particular header is different.

警告

这个答案是关于如何设置标题的.我对允许跨域请求一无所知.

This answer is strictly about how to set headers. I do not know anything about allowing cross domain requests.

关于 HTTP 标头

每个请求和响应都有标头.浏览器将其发送到网络服务器

Every request and response has headers. The browser sends this to the webserver

GET /index.htm HTTP/1.1

然后是标题

Host: www.example.com
User-Agent: (Browser/OS name and version information)
.. Additional headers indicating supported compression types and content types and other info

然后服务器发送响应

Content-type: text/html
Content-length: (number of bytes in file (optional))
Date: (server clock)
Server: (Webserver name and version information)

可以配置其他头文件，例如 Cache-Control，这完全取决于您的语言(PHP、CGI、Java、htaccess)和网络服务器(Apache 等).

Additional headers can be configured for example Cache-Control, it all depends on your language (PHP, CGI, Java, htaccess) and webserver (Apache, etc).

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