我已经创建了一个API(api.example.com),并希望能够从www.example.com访问。我还希望它可以从其他域名访问。因此,我添加了Access-Control-Allow-Origin:*。但是,当我打开www.example.com时,在所有API请求之前发送了一个预检请求(OPTIONS请求)。
我应该如何停止多个预检请求?我认为应该只有一个预检请求,我做错了什么!!!?或者浏览器在每次调用之前都必须发送预检请求吗?注意:我不想使用JSONP,因为我正在使其对公众可用Access-Control-Allow-Origin:*
OPTIONS调用头
Accept:*/*
Accept-Encoding:gzip,deflate,sdch
Accept-Language:en-US,en;q=0.8
Access-Control-Request-Headers:accept, authorization
Access-Control-Request-Method:GET
AlexaToolbar-ALX_NS_PH:AlexaToolbar/alxg-3.2
Connection:keep-alive
Host:api.touchtalent.biz
Origin:http://www.example.com
Referer:http://www.example.com/artist/52894/pratim-relekar
User-Agent:Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.114 Safari/537.36
OPTIONS调用响应
Access-Control-Allow-Headers:origin, x-requested-with, content-type, Authorization
Access-Control-Allow-Methods:PUT, GET, POST, DELETE
Access-Control-Allow-Origin:*
Connection:Keep-Alive
Content-Encoding:gzip
Content-Length:163
Content-Type:text/html
Date:Fri, 13 Jun 2014 14:24:55 GMT
Keep-Alive:timeout=5, max=98
Server:Apache/2.2.22 (Ubuntu)
Vary:Accept-Encoding
X-Powered-By:PHP/5.4.6-1ubuntu1.8
GET请求请求头
Accept:application/json, text/plain, */*
Accept-Encoding:gzip,deflate,sdch
Accept-Language:en-US,en;q=0.8
AlexaToolbar-ALX_NS_PH:AlexaToolbar/alxg-3.2
Authorization:Bearer VtQJqaTGd7YFb8Mee6GfiLwiRrUdt2iCp9ITuiUE
Connection:keep-alive
Host:api.touchtalent.biz
Origin:http://www.example.com
Referer:http://www.example.com/artist/52894/pratim-relekar
User-Agent:Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.114 Safari/537.36
获取请求响应头
Access-Control-Allow-Headers:origin, x-requested-with, content-type, Authorization
Access-Control-Allow-Methods:PUT, GET, POST, DELETE
Access-Control-Allow-Origin:*
Connection:Keep-Alive
Content-Length:1116
Content-Type:application/json
Date:Fri, 13 Jun 2014 14:24:55 GMT
Keep-Alive:timeout=5, max=97
Server:Apache/2.2.22 (Ubuntu)
Status:200
X-Powered-By:PHP/5.4.6-1ubuntu1.8
虽然我不想提供一个URL,因为它会随着开发的进行而改变。但如果可能会有所帮助:http://www.touchtalent.biz/home
更新1:
一旦我删除了Authorization:Bearer VtQJqaTGd7YFb8Mee6GfiLwiRrUdt2iCp9ITuiUE
头部,就停止了多次预检请求。但是删除此标头将破坏oauth实现。我仍然需要在不删除自定义头部的情况下防止多次预检请求。我该怎么办?
更新2:
添加Access-Control-Max-Age有所帮助,现在它不会为相同的请求发送预检请求。但对于不同的请求(不同的URL),它会发送多个OPTIONS请求。