NSURLConnection http PUT 与 HTTP_RANGE 不起作用

Question

我正在尝试从 iphone 将图像分块上传到服务器，我在服务器端有 PHP 代码，它读取数据并使用 HTTP_RANGE 附加到现有图像。

注意：服务器端代码已经过测试，并且使用浏览器中的 html 运行良好。

我的服务器端代码仅将 POST 作为 httpMethod，因此我必须在帖子正文中给出restMethod = PUT 和 HTTP_RANGE，如下所示：-

[bodyData appendData:[[NSString stringWithFormat:@"\r\n\r\n--%@\r\n", kHttpPostMimeBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
[bodyData appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"restMethod\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[bodyData appendData:[[NSString stringWithString:@"PUT"] dataUsingEncoding:NSUTF8StringEncoding]]; 

[bodyData appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", kHttpPostMimeBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
[bodyData appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"HTTP_RANGE\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[bodyData appendData:[[NSString stringWithFormat:@"%d-0",offset] dataUsingEncoding:NSUTF8StringEncoding]];  

上传的图像为 0KB。我还尝试仅使用restMethod = PUT和HTTP_RANGE=0-0以一大块发送文件，它仍然是0KB，但如果我只执行restMethod = PUT并省略HTTP_RANGE，则图像上传成功。

我真的很困惑这里，请帮忙！！

编辑::添加实际的HTTP请求:-

NSMutableURLRequest *req = [[NSMutableURLRequest alloc] initWithURL:url];

NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",
                             kHttpPostMimeBoundary];

[req addValue:contentType forHTTPHeaderField:@"Content-Type"];      

[req addValue:msgLength forHTTPHeaderField:@"Content-Length"];

[req setHTTPMethod:@"POST"];

NSMutableData *bodyData = [NSMutableData data];

[bodyData appendData:[[NSString stringWithFormat:@"\r\n\r\n--%@\r\n", kHttpPostMimeBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
[bodyData appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"restMethod\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[bodyData appendData:[[NSString stringWithString:@"PUT"] dataUsingEncoding:NSUTF8StringEncoding]];  

if (offset > 0) {
    [bodyData appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", kHttpPostMimeBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [bodyData appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"HTTP_RANGE\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    [bodyData appendData:[[NSString stringWithFormat:@"%d-0",offset] dataUsingEncoding:NSUTF8StringEncoding]];  

}
[bodyData appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", kHttpPostMimeBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
[bodyData appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"file\"; filename=\"%@\"\r\n",fileName] dataUsingEncoding:NSUTF8StringEncoding]];

[bodyData appendData:[[NSString stringWithFormat:@"Content-Type: %@\r\n\r\n",mimeType]
                      dataUsingEncoding:NSUTF8StringEncoding]];

[bodyData appendData:fileData];

[bodyData appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",kHttpPostMimeBoundary]
                      dataUsingEncoding:NSUTF8StringEncoding]];

NSString *msgLength = [NSString stringWithFormat:@"%d", [bodyData length]];
[headerParamDict setValue:msgLength forKey:@"Content-Length"];

[req setHTTPBody: bodyData];