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I am trying to send a simple GET/POST request to a dummy end point on https://requestbin.com/. I am using an ESP8266 module. I am using the arduino serial monitor to send these AT commands. I connect to wifi and then use the following AT commands

AT+CIPSTART="TCP","54.166.71.140 ",443  (the IP address from requestbin)

I then do

AT+CIPSEND=80

followed by

GET / HTTP/1.0\r\nHost: fc35001f8ec49962d182320446070d.m.pipedream.net\r\n\r\n

I get the output as follows

Recv 80 bytes

SEND OK

+IPD,272:HTTP/1.1 400 Bad Request
Server: awselb/2.0
Date: Mon, 07 Dec 2020 13:28:01 GMT
Content-Type: text/html
Content-Length: 122
Connection: close

<html>
<head><title>400 Bad Request</title></head>
<body>
<center><h1>400 Bad Request</h1></center>
</body>
</html>
CLOSED

Is there problem with the length of CIPSEND or the format of the request itself.

Improve this question
8
  • the \r\n are send as \r\n, not as new line characters Commented Dec 7, 2020 at 14:45
  • how should the At command look like in that case ? Commented Dec 7, 2020 at 14:47
  • send first GET / HTTP/1.0, then Host: fc35001f8ec49962d182320446070d.m.pipedream.net and then an empty line. do it fast before the connection times out Commented Dec 7, 2020 at 14:53
  • what would be the value for CIPSEND in this case ? Commented Dec 7, 2020 at 14:56
  • the count should include the new line charcaters. \r as 1 and \n as 1 character Commented Dec 7, 2020 at 14:58

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