Arduino HTTPClient passing string to variable

Question

For some reason I can't seem to pass a simple string from one variable to another. Below is my code:

 HTTPClient http; // Declare an object of class HTTPClient
 http.begin(address); // Specify request destination
 int httpCode = http.GET(); // Send the request
 Serial.println("String: " + http.getString());
 String prp = http.getString();
 Serial.println("temp string: " + prp);

It prints out:

String: < ! DOCTYPE HTML> 26

temp string:

Why doesnt my string get correctly passed on to my temporary string variable?

Tom

Answer 1

The getString() method calls writeToStream which is documented write all message body / payload to Stream. It writes all the data of the http response to he output and doesn't store them internally. The next call has nothing to read because the first call to getString() put everything out.

• Tom Schoehuijs: Is there a way I can adapt my code so that it will still work?
• Juraj: isn't it obvious? read into variable and then print the value of the variable. remove the redundant println
• Tom Schoehuijs: Isn't that what I do? The first println works fine, it's the second one that's the problem!
• Juraj: you throw away the String used in first println. but the response was only in that String. call to getString put the received bytes into that String.