ios 自定义协议继承NSURLProtocol设置请求头

这是一种简便的设置请求头的方法：

+ (void)load {

    [NSURLProtocol
registerClass:self];

}

+ (BOOL)canInitWithRequest:(NSURLRequest *)request {

    

    if ([request isKindOfClass:[NSMutableURLRequest
class]]) {

        

        [(id)request
setValue:[AppInfo
sharedInstance].appVersion
forHTTPHeaderField:@"AppVersionCode"];

        [(id)request
setValue:[AppInfo
sharedInstance].UMChannelId
forHTTPHeaderField:@"UMChannelId"];

        [(id)request
setValue:[AppInfo
sharedInstance].deviceId
forHTTPHeaderField:@"DeviceId"];

        [(id)request
setValue:@"IOS"
forHTTPHeaderField:@"AppClient"];

        

        

        NSString *token = [[NSUserDefaults
standardUserDefaults] valueForKey:@"token"];

        if (token.length >
0) {

            [(id)request
setValue:token forHTTPHeaderField:@"token"];

        }

        

    }

    return
NO;

    

}