快活林资源网 Design By www.csstdc.com

前言

最近在采用jquery ajax调用http请求时,发现了一系列问题:

如采用firebug调试API请求(这个API是自己服务器的应用),看到服务器明明返回200状态,response返回数据也是json格式,但ajax返回的error。

在排除json数据格式不正确的原因之后,发现了ajax error函数返回“networkerror failed to execute ‘send' on ‘xmlhttprequest' failed to load ‘http //“ XMLHttpRequest.status=0,就是没有初始化。

后来才知道是跨域问题(CORS),因为程序调用的是远程服务器的API,服务器不允许跨域调用。如果只是简单的方法,只需要在程序的response添加支持跨域的header添加属性”Access-Control-Allow-Origin: * “即可。

如java 服务器代码:

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服务器(如果是其他服务器,可以参考:I want to add CORS support to my server),需要在nginx.conf配置文件添加一下内容:

#
# 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';
}
}

总结

以上就是这篇文章的全部内容了,希望本文的内容对大家的学习或者工作能带来一定的帮助,如果有疑问大家可以留言交流,谢谢大家对的支持。

快活林资源网 Design By www.csstdc.com
广告合作:本站广告合作请联系QQ:858582 申请时备注:广告合作(否则不回)
免责声明:本站资源来自互联网收集,仅供用于学习和交流,请遵循相关法律法规,本站一切资源不代表本站立场,如有侵权、后门、不妥请联系本站删除!
快活林资源网 Design By www.csstdc.com