HTTP + GET + HEROKU

bourdonprince

Hi! I am trying the following code to make my Heroku app listen to new messages, but I'm obviously missing something. Can someone help me find it?

import processing.net.*;

Client c;
String data;

void setup() {
  size(200, 200);
  background(50);
  fill(200);
  c = new Client(this, "newapp.herokuapp.com", 80); // Connect to server on port 80
  c.write("GET / HTTP/1.0\r\n"); // Use the HTTP "GET" command to ask for a Web page
  c.write("\r\n");

  int newValue = 10;

  String tempLink = "GET /api/device/mydevice/sensor/temp/report?value=";
  String postDataTemp = tempLink+ newValue +" "+"HTTP/1.1";

  if (c.available()>0) {  
    c.write(postDataTemp);
    c.write("Host: newapp.herokuapp.com");
    c.write("Connection: close");
    String message = c.readString();
    println(message);
    c.stop();
  }
}

void draw() {
}

bourdonprince

Changed a couple of things, still nothing as a response:

import processing.net.*;
Client c;

//Variables
String tempLink;
String serverName;
String postDataTemp;
int newValue;

void setup() {
  size(200, 200);
  background(50);
  fill(200);

  serverName = "newapp.herokuapp.com";

  //String to GET the new value
  tempLink = "GET /api/device/mydevice/sensor/temp/report?value=";
  c = new Client(this, serverName, 80); // Connect to server on port 80
  newValue = 10;

  //String to include the HTTP command for the server
  postDataTemp = tempLink+ newValue +" "+"HTTP/1.1";

  if (c.available()>0) {  
    //Client writes the HTTP command...
    c.write(postDataTemp+"\r\n"); // Use the HTTP "GET" command to ask for a Web page
    c.write("Host: newapp.herokuapp.com");
    c.write("Connection: close");
    String message = c.readString();
    println(message);
    c.stop();
  }
}

void draw() {
}

bourdonprince

Now I get the following:

HTTP/1.1 404 Not Found Connection: keep-alive Server: Cowboy Date: Thu, 06 Nov 2014 12:53:03 GMT Content-Length: 2960 Content-Type: text/html; charset=utf-8 Cache-Control: no-cache, no-store

import processing.net.*;
Client c;
String data;
String myserver = "newapp.herokuapp.com";

void setup() {
  c = new Client(this, myserver, 80); 
  c.write("GET /api/device/mydevice/sensor/temp/report?value=1 HTTP/1.1"); 
  c.write("\r\n"); 
  c.write("Host: "+myserver+" \r\n"); 
  c.write("Connection: close");
  c.write("Content-Type: text/html; charset=utf-8\r\n"); 
  c.write("Content-Length: 2960\r\n"); 
  c.write("\r\n"); 
}

void draw() {
  if (c.available() > 0) { // If there's incoming data from the client...
    data = c.readString(); // ...then grab it and print it
    println(data);
  }
}

sfan

There is no issue with your Processing Code whatsoever. My guess would be that your issue lies with Hirokuapp (or how you understood their api) and not with Processing. Maybe you should take a closer look at the Server response:

There is no app configured at that hostname. Perhaps the app owner has renamed it, or you mistyped the URL.

By the way, since it's only a GET command, you can try this on your Browser too: newapp.herokuapp.com/api/device/mydevice/sensor/temp/report?value= newapp.herokuapp.com/api/device/mydevice/sensor/temp/report?value=1

bourdonprince

The link points to nowhere - this isn't the name of the app.

However, when I post the correct link in a browser, data are received just fine in the app (values are updated). I still haven't been able to use Processing for this job...

bourdonprince

aaaaaaahhhhhh.....!!!!!!! Found the bug!

Instead of:   c.write("Host: "+myserver+" \r\n");

It had to be:   c.write("Host: "+myserver+"\r\n");

Get it?

:-)

sfan

ah, there you go. :)