Php nginx server received weird header and published data from http request

Our application server received some strange request, http headers like:

"Content-Type": "application/x-www-form-urlencoded",
"Content-Length": "3177",
"Host": "xxxxxxxxx",
"Accept": "*/*",
"Accept-Encoding": "gzip",
"Msisdn": "12345678",

And the read body of the http message using file_get_contents('php://input')started with:ISDN: 12345678\r\n\r\n

The header Msisdnand ISDN: 12345678\r\n\r\nwere not sent by the application client.

Our application is written in cpp using libcurl to work with an http request. I really don't know what happened now. Especially ISDN: 12345678\r\n\r\nin the contents after the body.

All suggestions are welcome.

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