移动客户端HTTP head中增加内容

在之前的开发中遇到一个需求 需要像http head 中增加客户端的类型 和版本号，下面就说说怎么加及 需要注意的一些细节：

 1 +(NSMutableURLRequest*)addHTTPRequestHeaderInfo:(NSURL*)requestUrl
 2 {    
 3     NSMutableURLRequest *mutableRequest = [[[NSMutableURLRequest alloc]initWithURL:requestUrl]autorelease];
 4     NSDictionary *infoDict =[[NSBundle mainBundle] infoDictionary];
 5     NSString *versionNum =[infoDict stringForKey:@"CFBundleVersion"];
 6     NSString *appName =[infoDict stringForKey:@"CFBundleExecutable"];
 7     [mutableRequest addValue:appName forHTTPHeaderField:@"app-id"];
 8     [mutableRequest addValue:@"ios" forHTTPHeaderField:@"client-type"];
 9     [mutableRequest addValue:versionNum forHTTPHeaderField:@"app-version"];
10     NSLog(@"%@", mutableRequest.allHTTPHeaderFields);
11     return mutableRequest;
12 }