这是返回的消息    {"error_code":100,"error_msg":"Invalid parameter"}HTTP/1.1 400 Bad Request

以下是我的请求代码：

strcat(buf,"POST /rest/2.0/ocr/v1/general_basic? access_token=24.5cb7f5414c9e65f83cdc55415a1a610d.259 2000.1555075556.2825-15750884 HTTP/1.1\r\n");
 strcat(buf,"Host: aip.baidubce.com\r\n");
 //strcat(buf,"Content-Length: 187\r\n");
strcat(buf,"Content-Type: application/x-www-form -urlencoded\r\n");

strcat(buf,"image_type: BASE64\r\n");

strcat(buf,"image: /9j/4AAQSkZJRgABAQAAAQABAAD/2 wBDAAgGBgcGBQgHBwcJCQgKDBQNDAsL等很长一串“）；

strcat(buf,"group_id: gropu001\r\n");
48 strcat(buf,"user_id: 00001\r\n");