banma

在部署项目的时候碰到这么一个问题:XMLHttpRequest cannot load,下面阐述一下这个问题

问题背景:

用nginx+tomcat部署项目。tomcat用的8080端口,nginx用80代理8080端口。项目成功启动,但凡事涉及到ajax的数据调用全部都报 XMLHttpRequest cannot load的错

问题原因:

由于同源策略的限制,XmlHttpRequest只允许请求当前源(域名、协议、端口)的资源,只有域名、协议、端口三者都相同才会被认为是相同资源,而且ajax本身是不可以跨域的。而浏览器访问的是80端口、ajax方法访问的是8080端口,所以就会报错。

 

解决方案:

修改nginx配置文件,在server中加入如下代码

server {

        listen       80;

        server_name www.beib.com;

        index index.html index.htm index.php default.html default.htm default.php;

        root  /home/am/webapps/am;

 

      

location / {

add_header \'Access-Control-Allow-Origin\' \'*\';

#

# Om nom nom cookies

#

add_header \'Access-Control-Allow-Credentials\' \'true\';

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\';

proxy_pass http://www.beib.com:8080/;

proxy_set_header Host "www.beib.com";

}

        error_page   500 502 503 504  /50x.html;

        location = /50x.html {

            root   html;

        }

    }

 

 

 

问题解决了以后突然发现上传超过1M大的客户端文件无法正常上传,于是修改了下nginx的配置。

server {

        listen       80;

        server_name www.beib.com;

        index index.html index.htm index.php default.html default.htm default.php;

        root  /home/am/webapps/am;

 

      

location / {

add_header \'Access-Control-Allow-Origin\' \'*\';

#

# Om nom nom cookies

#

add_header \'Access-Control-Allow-Credentials\' \'true\';

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\';

proxy_pass http://www.beib.com:8080/;

client_max_body_size    1000m;

proxy_set_header Host "www.beib.com";

}

        error_page   500 502 503 504  /50x.html;

        location = /50x.html {

            root   html;

        }

    }

 

 

其实只是在location里加了如下一行代码

 

 

 

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