Proxy_pass and Regular Expression

Proxy_pass and regular expression I tried to use if, location to process some URLs, and then allowed to proxy_pass to repeatedly try to prompt the following error www.2cto.com nginx: [emerg] "proxy_pass" cannot have URI part in location given by regular expression, or inside named location, or inside "if" statement, or inside "limit_0000t" block in/etc/nginx/conf. d/info.mydomain.com. conf: 112? Nginx: configuration file/etc/nginx. conf test failed finally found that using the $ request_uri variable can solve the above problem. www.2cto.com if ($ request_uri ~ "^/\ W + \. xml $") {proxy_pass http://www.mydomain.com/xml?request_uri=break;} if ($ request_uri ~ "^/Public/datas/\ w + \. xml $") {proxy_pass http://www.mydomain.com/?request_uri=break ;}