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compatibility issue with TinyGSM #31

Description

@mcr-ksh

When using TinyGSM, the request is seen on the server side but the client side will receive a timeout when using httpclient->responseStatusCode().

After a lot of debugging I found that the issue might be due to the way the library slowly transmits the request:

CONNECT OK

OK
AT+CIPSEND=1,4

>POST
OK
AT+CIPSEND=1,1

> 
OK
AT+CIPSEND=1,7

>/test/
OK
AT+CIPSEND=1,9

> HTTP/1.1
OK
AT+CIPSEND=1,2

>

OK
AT+CIPSEND=1,10

>Connection
OK
AT+CIPSEND=1,2

>: 
OK
AT+CIPSEND=1,5

>close
OK
AT+CIPSEND=1,2

>

OK
AT+CIPSEND=1,4

>Host
OK
AT+CIPSEND=1,2

>: 
OK
AT+CIPSEND=1,20

Finally the timeout is occurring when calling httpclient->endRequest() does not seem to send "\r\n\r\n".

If I add:

httpclient->write((const byte*)"\r\n", 2);

the server reply is received.

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