nginx location匹配优先级 location blocks with the = modifier: If the specified string exactly matches the requested URI, Nginx retains the location block. 匹配使用=的严格相等的路径 location blocks with no modifier: If the specified string exactly matches the requested URI, Nginx retains the location block. 匹配严格相等的无匹配符号的路径，例如 location /abc {…}，请求正好为/abc location blocks with the ^~ modifier: If the specified string matches the beginning of the requested URI, Nginx retains the location block.