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Author Topic: Client Ethernet GET Request badly formatted  (Read 1930 times)
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Hello to everyone.

I have a an Arduino board (Rev.3), an ethernet shield and I use the IDE 1.0 in Ubuntu 11.10
My problem is sending HTTP requests that arrive badly formatted to the web server (apache2):
Code:
192.168.1.69 - - [21/Jan/2012:13:42:28 +0100] "GET /arduino/ HTTP/1.0ogle.com" 200 285 "-" "-"
192.168.1.69 - - [21/Jan/2012:13:42:37 +0100] "GET /arduino/ HTTP/1.0://wGET /arduino/ HTTP/1.0" 200 285 "-" "-"192.168.1.69 - - [21/Jan/2012:13:42:28 +0100] "GET /arduino/ HTTP/1.0ogle.com" 200 285 "-" "-"
192.168.1.69 - - [21/Jan/2012:13:42:37 +0100] "GET /arduino/ HTTP/1.0://wGET /arduino/ HTTP/1.0" 200 285 "-" "-"
192.168.1.69 - - [21/Jan/2012:13:43:44 +0100] "\xf8\x1bF\x13J" 400 301 "-" "-"

I think it's a problem of buffer, but I can not understand how to solve.
A snippet of code:
Code:
byte server[]= {192,168,1,51};
byte mac[] = {0x90, 0xA2, 0xDA, 0x00, 0xFF, 0xF3};
byte ip[]= {192,168,1,69};
byte gateway[] = { 192, 168, 1, 1 };
////////////////////////////////////////////////////////////////////////

EthernetClient client;

void setup(){
  Ethernet.begin(mac,ip,gateway);
  Serial.begin(9600);
  if (client.connect(server, 80)) {
    client.println("GET /arduino/ HTTP/1.0");
    client.println();
  }
}

Thank you very much
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Why just a snippet? Let's see it all!  smiley
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Hi, thanks for your reply.

I have simply modified this example http://bildr.org/2011/06/arduino-ethernet-client/ (Unfortunately it does not work)

I don't understand what's the problem.
Please help me  smiley-razz



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"does not work" is very vague. I recommend trying the example in the IDE Examples folder. Under Ethernet, there is a web client. Probably more help available for that code.
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Client test code you can try.

Code:
//zoomkat 12-08-11
//simple client test
//for use with IDE 1.0
//open serial monitor and send an e to test
//for use with W5100 based ethernet shields

#include <SPI.h>
#include <Ethernet.h>

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; //physical mac address
byte ip[] = { 192, 168, 1, 102 }; // ip in lan assigned to arduino
//byte gateway[] = { 192, 168, 1, 1 }; // internet access via router
//byte subnet[] = { 255, 255, 255, 0 }; //subnet mask
byte myserver[] = { 208, 104, 2, 86 }; // zoomkat web page server IP address
EthernetClient client;
//////////////////////

void setup(){

  Ethernet.begin(mac, ip);
  //Ethernet.begin(mac, ip, subnet, gateway);
  Serial.begin(9600);
  Serial.println("Better client test 12/01/11"); // so I can keep track of what is loaded
  Serial.println("Send an e in serial monitor to test"); // what to do to test
}

void loop(){
  // check for serial input
  if (Serial.available() > 0) //if something in serial buffer
  {
    byte inChar; // sets inChar as a byte
    inChar = Serial.read(); //gets byte from buffer
    if(inChar == 'e') // checks to see byte is an e
    {
      sendGET(); // call sendGET function below when byte is an e
    }
  } 
}

//////////////////////////

void sendGET() //client function to send/receive GET request data.
{
  if (client.connect(myserver, 80)) {  //starts client connection, checks for connection
    Serial.println("connected");
    client.println("GET /~shb/arduino.txt HTTP/1.0"); //download text
    client.println(); //end of get request
  }
  else {
    Serial.println("connection failed"); //error message if no client connect
    Serial.println();
  }

  while(client.connected() && !client.available()) delay(1); //waits for data
  while (client.connected() || client.available()) { //connected or data available
    char c = client.read(); //gets byte from ethernet buffer
    Serial.print(c); //prints byte to serial monitor
  }

  Serial.println();
  Serial.println("disconnecting.");
  Serial.println("==================");
  Serial.println();
  client.stop(); //stop client

}

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Thanks zoomkat,
I will try your code as soon as possible.

Thank you very much smiley
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Hi zoomkat, unfortunately your code doesn't work in my installation
I have also tried the bottom code but a "Malformed Packet Exception" occurred (I attach the packet detected with wireshark)

Code:
/*
  Web client
 
 This sketch connects to a website (http://www.google.com)
 using an Arduino Wiznet Ethernet shield.
 
 Circuit:
 * Ethernet shield attached to pins 10, 11, 12, 13
 
 created 18 Dec 2009
 by David A. Mellis
 
 */

#include <SPI.h>
#include <Ethernet.h>

// Enter a MAC address for your controller below.
// Newer Ethernet shields have a MAC address printed on a sticker on the shield
byte mac[] = {0x90, 0xA2, 0xDA, 0x00, 0xFF, 0xF3};
IPAddress server(173,194,35,56); // Google

// Initialize the Ethernet client library
// with the IP address and port of the server
// that you want to connect to (port 80 is default for HTTP):
EthernetClient client;

void setup() {
  // start the serial library:
  Serial.begin(9600);
  // start the Ethernet connection:
  if (Ethernet.begin(mac) == 0) {
    Serial.println("Failed to configure Ethernet using DHCP");
    // no point in carrying on, so do nothing forevermore:
    for(;;)
      ;
  }
  // give the Ethernet shield a second to initialize:
  delay(1000);
  Serial.println("connecting...");

  // if you get a connection, report back via serial:
  if (client.connect(server, 80)) {
    Serial.println("connected");
    // Make a HTTP request:
    client.println("GET /search?q=arduino HTTP/1.0");
    client.println();
  }
  else {
    // kf you didn't get a connection to the server:
    Serial.println("connection failed");
  }
}

void loop()
{
  // if there are incoming bytes available
  // from the server, read them and print them:
  if (client.available()) {
    char c = client.read();
    Serial.print(c);
  }

  // if the server's disconnected, stop the client:
  if (!client.connected()) {
    Serial.println();
    Serial.println("disconnecting.");
    client.stop();

    // do nothing forevermore:
    for(;;)
      ;
  }
}

* dhcp (2.03 KB - downloaded 14 times.)
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Below is what I get when I run my test code. My ISP is running an apache server, so perhaps your issue is with your apache setup.

Code:
Better client test 12/01/11
Send an e in serial monitor to test
connected
HTTP/1.1 200 OK
Date: Fri, 27 Jan 2012 01:33:24 GMT
Server: Apache
Last-Modified: Sat, 13 Nov 2010 16:31:40 GMT
Accept-Ranges: bytes
Content-Length: 51
Connection: close
Content-Type: text/plain; charset=UTF-8

Woohoo! Your arduino ethernet client works!
zoomkat
disconnecting.
==================

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Sorry, I don't understand. In my last example I have tried to contact the google server.
But beyond this, my ethernet shield doesn't acquire a good ip address.  A "Malformed Packet Exception" occurred during DHCP discovery
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Quote
Hi zoomkat, unfortunately your code doesn't work in my installation
"doesn't work" is still vague.

Doesn't compile?
Doesn't run?
Where does zoomkat's code stop in "your installation"?
What is the last message?
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Hi ST,

my scketch is correctly compiled.
It runs  but It has the same problem of my first post:
1. the "get request" is badly formatted ("GET /arduino/ HTTP/1.0ogle.com" 200 285 "-" "-") 
2. my serial monitor displays random characters without stopping
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OK. Then we will start with the stuff that causes interference like that with the w5100 chip. The first is the microSD SPI interface.
Code:
void setup(){

  // disable SD SPI interface
  pinMode(4,OUTPUT);
  digitalWrite(4,HIGH);

  Ethernet.begin(mac, ip);
  //Ethernet.begin(mac, ip, subnet, gateway);
  Serial.begin(9600);
  Serial.println("Better client test 12/01/11"); // so I can keep track of what is loaded
  Serial.println("Send an e in serial monitor to test"); // what to do to test
}
Try that first, even tho I think this is going to be the second thing I recommend.
How does that do? Still garbage out the serial monitor?

Add: May as well make it one response. Here is another topic with the second suggestion. Read reply#6.
http://arduino.cc/forum/index.php/topic,86729.0.html
« Last Edit: January 27, 2012, 09:10:22 am by SurferTim » Logged

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I love you smiley-kiss
I have read reply#6 and I solved by replacing the code in w5100.h
Thank you very much
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