{"code":"SIGN_ERROR","detail":{"detail":{"issue":"sign not match"},"field":"signature","location":"authorization","sign_information":{"method":"POST","sign_message_length":56,"truncated_sign_message":"POST\n/v3/merchant/media/upload\n1582110247\nfqeejh1f.d3a\n\n","url":"/v3/merchant/media/upload"}},"message":"错误的签名，验签失败"}

其中微信给我返回的truncated_sign_message为POST\n/v3/merchant/media/upload\n1582110247\nfqeejh1f.d3a\n\n,我看这个字符串里面缺少了json报文体,而我的请求确实给微信提交了json字符串.下面这个是我的报文.为什么你们微信那边在拼接签名串的时候把 {filename:"logo.jpg",...} 这个json报文没有返回给我.