前言
最近在采用jquery ajax調(diào)用http請(qǐng)求時(shí),發(fā)現(xiàn)了一系列問題:
如采用firebug調(diào)試API請(qǐng)求(這個(gè)API是自己服務(wù)器的應(yīng)用),看到服務(wù)器明明返回200狀態(tài),response返回?cái)?shù)據(jù)也是json格式,但ajax返回的error。
在排除json數(shù)據(jù)格式不正確的原因之后,發(fā)現(xiàn)了ajax error函數(shù)返回“networkerror failed to execute ‘send' on ‘xmlhttprequest' failed to load ‘http //“ XMLHttpRequest.status=0,就是沒有初始化。
后來才知道是跨域問題(CORS),因?yàn)槌绦蛘{(diào)用的是遠(yuǎn)程服務(wù)器的API,服務(wù)器不允許跨域調(diào)用。如果只是簡單的方法,只需要在程序的response添加支持跨域的header添加屬性”Access-Control-Allow-Origin: *
“即可。
如java 服務(wù)器代碼:
yourownvariable.setHeader("Access-Control-Allow-Origin:", "origin url of your site");yourownvariable.setHeader("Access-Control-Allow-Methods", "GET, POST,PUT");
如果是配置nginx服務(wù)器(如果是其他服務(wù)器,可以參考:I want to add CORS support to my server),需要在nginx.conf配置文件添加一下內(nèi)容:
## Wide-open CORS config for nginx#location / {if ($request_method = 'OPTIONS') {add_header 'Access-Control-Allow-Origin' '*';add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';## Custom headers and headers various browsers *should* be OK with but aren't#add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range';## Tell client that this pre-flight info is valid for 20 days#add_header 'Access-Control-Max-Age' 1728000;add_header 'Content-Type' 'text/plain charset=UTF-8';add_header 'Content-Length' 0;return 204;}if ($request_method = 'POST') {add_header 'Access-Control-Allow-Origin' '*';add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range';add_header 'Access-Control-Expose-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range';}if ($request_method = 'GET') {add_header 'Access-Control-Allow-Origin' '*';add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range';add_header 'Access-Control-Expose-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range';}}
總結(jié)
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