AFNetworking 3.0+ 设置请求头Header

我项目里网络请求的Content-Type是application/octet-stream;charset=utf-8。
这种方式跟application/json的不一样，请求参数是二进制的数据流形式的，必须放到body里面去请求。所以问题来了，之前项目用的AFNetworking是2.5.+ 的，现在更新了AFNetworking到3.0+，发现之前的网络请求的AFHTTPRequestOperation被废弃了。现在用AFHTTPSessionManager代替了。不知道怎么设置Header？？

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AFNetworking 2.0+ 设置请求头

 NSMutableURLRequest *jsonRequest = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:request.stringOfApiURLString]]; jsonRequest.HTTPMethod = @"POST"; NSMutableData *postBody = [NSMutableData data]; int msgid = request.msgid; NSData *dataMsgid = [NSData dataWithBytes:&msgid length: 4];    [postBody appendData:dataMsgid]; AFHTTPRequestOperation *op = [[AFHTTPRequestOperation alloc] initWithRequest:jsonRequest];    [op.securityPolicy setAllowInvalidCertificates:YES];    [op.securityPolicy setValidatesDomainName:NO];    [op.securityPolicy setValidatesCertificateChain:NO];    op.responseSerializer = [AFHTTPResponseSerializer serializer];    [op setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObj){     //处理数据        }    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {        if (failure) {            failure(error);            NSString *str = [[NSString alloc]initWithData:operation.responseObject encoding:NSUTF8StringEncoding];            NSLog(@"--- request error   %@",str);        }    }];    [[NSOperationQueue mainQueue] addOperation:op];

AFNetworking 3.0+ 设置请求头

NSMutableURLRequest *jsonRequest = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:request.stringOfApiURLString]]; jsonRequest.HTTPMethod = @"POST"; NSMutableData *postBody = [NSMutableData data]; int msgid = request.msgid; NSData *dataMsgid = [NSData dataWithBytes:&msgid length: 4];    [postBody appendData:dataMsgid]; AFHTTPSessionManager *manager = [AFHTTPSessionManager manager]; [manager setSecurityPolicy:[AFSecurityPolicy policyWithPinningMode:AFSSLPinningModeNone]];AFHTTPRequestSerializer *requestSerializer = [AFHTTPRequestSerializer serializer];[requestSerializer setStringEncoding:NSUTF8StringEncoding];//    [requestSerializer setTimeoutInterval:10]; [requestSerializer setValue:@"application/octet-stream;charset=utf-8" forHTTPHeaderField:@"Content-Type"];[manager setRequestSerializer:requestSerializer];AFHTTPResponseSerializer *responseSerializer = [AFHTTPResponseSerializer serializer];[responseSerializer setAcceptableContentTypes:[NSSet setWithObjects:@"application/octet-stream", nil]];[manager setResponseSerializer:responseSerializer];[[manager dataTaskWithRequest:request completionHandler:^(NSURLResponse * _Nonnull response, id  _Nullable responseObject, NSError * _Nullable error) {if (!error) {NSLog(@"Reply JSON: %@", responseObject);if ([responseObject isKindOfClass:[NSDictionary class]]) {//处理你的数据    }} else {NSLog(@"Error: %@, %@, %@", error, response, responseObject);}}] resume];