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Background

The xml data of Dahua camera Onvif protocol response did not carry a namespace, which led to the failure of Onvif protocol service parsing. In order to be compatible with this camera, it was decided to modify onvif_client and ignore the namespace. Since there is no problem with the camera locally, you need to start the HTTP server to simulate the Onvif protocol, receive the http request sent by the Onvif client and respond.

problem

After a request from the onvif client is modified, the ip and the port are successfully connected to the HTTP server, the request is successful, but the xml data of the HTTP service response is truncated, and the packet grab shows that the connection is closed after the HTTP server data is sent.

Solution

With the help of the leader, the reason is that the http request sent by the onvif client does not carry a keep-alive header, which causes the http connection to be not a persistent connection and the HTTP server shuts down actively. Check the HTTP server source code to find keep-alive

Grep-rn "keep-alive". /

Find key information

If the connection header is present in the request and its value isn't keep-alive, then close

View the source code

Find the key code and comment out the close logo to ensure the integrity of the data transmission without carrying the keep-alive request header.

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