ESP32 Forum

Posted: **Fri Feb 28, 2020 4:29 am**

First off the ESP products are awesome!

I'm porting some esp8266 code to an esp32. Oddly enough this piece of the code works perfect on the 8266, but not on the 32. The server is erroring with "code 400, message Bad HTTP/0.9 request type ('POST')". Looking at wireshark i'm not really seeing any issues other than the server rejects with packets out of order. Any ideas? I have been looking at this for quite some time and don't see anything wrong.

code:

Code: Select all

  char json_string[430];
  serializeJson(dataToSend,json_string);
  serializeJsonPretty(dataToSend,Serial);

  if((WiFi.status() == WL_CONNECTED)){   //Check WiFi connection status
    HTTPClient http;  
    http.begin("http://turnkey.serve.com:30030");      
    http.addHeader("Content-Type", "application/json");  
    int httpCode = http.POST(json_string);  
    String payload = http.getString();   //Get the response payload
    http.end();  //Close connection move this up higher?

  }
}

Here's a serial printout of json_string

Code: Select all

{
  "NetBios": "esp-micro-982261",
  "Guid": "1401d38e2c-4bfcdad55583",
  "ntpUTC": "02/28/2020 04:16:10",
  "upHours": 0,
  "upMinutes": 16,
  "HeapB": 234980,
  "MAC": "24:62:AB:D4:CE:88",
  "IP": "192.168.43.37",
  "AC": "PeriodicUpdate32",
  "SW": "0.0.14"
}

Here's a python 2.7 server that recreates the error

Code: Select all

from BaseHTTPServer import BaseHTTPRequestHandler
import pprint
import json

localIPAddress = '192.168.1.80'


class PostHandler(BaseHTTPRequestHandler):

    def do_POST(self):

        content_length = int(self.headers['Content-Length'])
        post_data = self.rfile.read(content_length)
        json_data = json.loads(post_data)

        pp = pprint.PrettyPrinter(indent=4)
        print pp.pprint(json_data)

        self.send_response(200)
        self.end_headers()

        return


if __name__ == '__main__':
    from BaseHTTPServer import HTTPServer
    server = HTTPServer((localIPAddress, 8080), PostHandler)
    print 'Starting server, use <Ctrl-C> to stop'
    server.serve_forever()

Here are the two tcp conversations between esp and server taken with wireshark on the server
ESP32 (server has errors):

Code: Select all

POST  HTTP/1.1
Host: http://turnkey.serve.com:30030
User-Agent: ESP32HTTPClient
Connection: keep-alive
Accept-Encoding: identity;q=1,chunked;q=0.1,*;q=0
Content-Type: application/json
Content-Length: 234

<head>
<title>Error response</title>
</head>
<body>
<h1>Error response</h1>
<p>Error code 400.
<p>Message: Bad HTTP/0.9 request type ('POST').
<p>Error code explanation: 400 = Bad request syntax or unsupported method.
</body>

{"NetBios":"esp-micro-982261","Guid":"1401d38e2c-4bfcdad55583","ntpUTC":"02/28/2020 04:09:47","upHours":0,"upMinutes":10,"HeapB":229956,"MAC":"24:62:AB:D4:CA:88","IP":"192.168.43.37","AC":"PeriodicUpdate32","SW":"0.0.14"}

ESP8266 (server has no errors)

Code: Select all


POST / HTTP/1.1
Host: http://turnkey.serve.com:30030
User-Agent: ESP8266HTTPClient
Connection: keep-alive
Accept-Encoding: identity;q=1,chunked;q=0.1,*;q=0
Content-Type: application/json
Content-Length: 230

{"NetBios":"esp-micro-254565","Guid":"aafcd202f6-30a4504f734d","ntpUTC":"02/28/2020 04:13:53","upHours":0,"upMinutes":1,"HeapB":46400,"MAC":"4C:11:AE:0C:CA:FA","IP":"192.168.1.127","AC":"PeriodicUpdate","SW":"0.0.14"}HTTP/1.0 200 OK
Server: BaseHTTP/0.3 Python/2.7.17
Date: Fri, 28 Feb 2020 04:13:53 GMT

ESP32 Forum

http post creates remote server error. Esp8266 works, esp32 doesn't

http post creates remote server error. Esp8266 works, esp32 doesn't