Hi all,
I am currently following the ESP32 course for a personal project.
I need to send an HTTP Post request to retrieve an API token.
I have built the request in Postman and it is working fine
The request is as follow:

POST /app/login HTTP/1.1
Host: euapi.gizwits.com
X-Gizwits-Application-Id: c70a66ff039d41b4a220e198b0fcc8b3
Content-Type: text/plain
Content-Length: 71
{
“username”: “my email address”,
“password”: “my password”
}
this is the http code result from postman (code view in postman)
The request is built with –>
Headers
{
X-Gizwits-Application-Id = c70a66ff039d41b4a220e198b0fcc8b3
}
Body
{
“username”: “my email address”,
“password”: “my password”
}

The request is properly working in Postman and returning this:

{
“token”: “my token”,
“uid”: “my uid”,
“expire_at”: expiration_date
}

Now in my code (VSCode + PlatformIO) I have created the following function and I am calling it in setup() –>

char GetToken() {

String httpRequestData;
String mylogin = MY_LOGIN;
String mypwd = MY_PWD;

HTTPClient http;

const char* serverName = “http://euapi.gizwits.com/app/login“;

// Your Domain name with URL path or IP address with path
http.begin(serverName);

// Specify content-type header
http.addHeader(“X-Gizwits-Application-Id”, “c70a66ff039d41b4a220e198b0fcc8b3”);
http.addHeader(“Content-Type”, “text/plain”);

// Data to send with HTTP POST
httpRequestData=”username=” + mylogin + “&password=” + mypwd;

// Send HTTP POST request
int httpResponseCode = http.POST(httpRequestData);

Serial.print(“HTTP Response code: “);
Serial.println(httpResponseCode);

// Free resources
http.end();

}

I have not yet reached the step where I extract the JSON information with the token because I get an HTTP400 response which I guess means something is not well encoded in my request.

Can you please help me out?
Thanks!