ESP8266 & HttpClient always leads to "Invalid HTTP request"

Projects Programming
1

Hello,
I have the following code to post some data to a webserver. I adjusted one of the templates available:

void log_data (String datum, String uhrzeit, String kartentyp, String kartennummer, String zutritt_erlaubt)
{
  HTTPClient http;
  //Build call string:
  String dataline = "https://<myurl>/log_data.php";
  dataline += "?datum=" + datum;
  dataline += "&uhrzeit=" + uhrzeit;
  dataline += "&kartentyp=" + kartentyp;
  dataline += "&kartennummer=" + kartennummer;
  dataline += "&zutritt_erlaubt=" + zutritt_erlaubt;
  bool httpResult = http.begin(dataline);
  if(!httpResult)
  {
    Serial.println(F("[FEHLER]: Invalid HTTP request:"));
    Serial.println(dataline);
  }
  else
  {
    int httpCode = http.GET();
    if (httpCode > 0) { // Request has been made
        Serial.printf("[INFO]: HTTP status: %d\n", httpCode);
        String payload = http.getString();
        Serial.println(payload);
    }
    else
    { // Request could not be made
      Serial.printf("[FEHLER]: GET... fehlgeschlagen, Fehler: %s\n", http.errorToString(httpCode).c_str());
    }
  }
  http.end();
}

The problem is: The URL which is being generated ("dataline") works perfectly when I paste it into the address line of my browser. But the Arduino always ends up with "Invalid HTTP request" - and I have no idea why. And since I only get a bool as return value, I don't have any idea where to keep looking at.

Is it because I'm posting towards a HTTPS site?

Any help is appreciated - thanks (spent at least four hours now without any succes)

2

Boby71:
Is it because I'm posting towards a HTTPS site?

If so what would you have to change ?

Boby71:
(spent at least four hours now without any succes)

Success is relative ! (the more success the more relatives..)

3

Thanks, found a simple solution: I just needed to add the fingerprint at the http.begin, then it started to work. Thanks for the hint!