通过HTTP PUT方法实现文件上传的步骤

// 1. URLRequest
NSURL *url = [NSURL URLWithString:@ "http://localhost/uploads/xxx.png" ];
NSMutableURLRequest *requestM = [NSMutableURLRequest requestWithURL:url cachePolicy:0 timeoutInterval:2.0f];
requestM.HTTPMethod = @ "PUT" ;
// 设置用户授权
// 1> 授权字符串(用户名+密码)
NSString *authStr = @ "admin:123456" ;
// 2> BASE 64编码
NSData *authData = [authStr dataUsingEncoding:NSUTF8StringEncoding];
NSString *base64Str = [authData base64EncodedStringWithOptions:0];
NSString *auth = [NSString stringWithFormat:@ "BASIC %@" , base64Str];
[requestM setValue:auth forHTTPHeaderField:@ "Authorization" ];