C#

var url = $@"https://api.weixin.qq.com/wxa/get_qrcode?access_token={authorizerAccessToken}&path=pages%2Findex%3index%3D1";

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);

request.Method = "GET";

request.ContentType = "text/html;charset=UTF-8";

HttpWebResponse response = (HttpWebResponse)request.GetResponse();

Stream stm = response.GetResponseStream();

StreamReader myStreamReader = new StreamReader(stm, Encoding.Default);

string retString = myStreamReader.ReadToEnd();

 请求通信后，C# 输出retString返回了一堆乱码的字符串，编码什么都尝试过了，不知道是不是我使用的方法不对

官方文档示例：请求正常的情况下，开发者可以直接将返回的二进制结果（response body）保存成图片

Connection: closeContent-Type: image/jpegContent-disposition: attachment; filename="QRCode.jpg"Date: Sun, 06 Jan 2013 10:20:18 GMTCache-Control: no-cache, must-revalidateContent-Length: 339721