Networking issues

Core Library Questions

jean_np

in Core Library Questions • 3 years ago

I'm not sure of the way I can use the Nerwork Client class

The examples only show how to call an IP adress, but is it possible to get a full URL line "http://www.google.com" ?

When I try this...

myClient = new Client(this, "http://www.google.com", 80);

... I get this answer :

java.net.UnknownHostException: http://www.google.com

Replies(6)

jean_np

Re: Networking issues

3 years ago

Oh, I see there are answers in the "learning" section. To start, it seems the http:// isn't useful.

jean_np

Re: Networking issues

3 years ago

This code seems to work, except that the server sends a 400 error page

import processing.net.*;
Client c;
String data;
void setup() {
size(200, 200);
background(50);
fill(200);
c = new Client(this, "www.hyperbate.com", 80);
c.write("GET /tests/chiffre.php HTTP/1.1");
c.write("Host: www.mywebsite.com\n\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);
}
}

Any clue ?

damarusama

it seems like your host is redirecting to your page - and not having one ip address per domain name. which seems to confuse the processing client ~ I might be wrong but it seems that ovh.com is redirecting your domain name and what the processing client is picking up is the first host that it sees (ovh.com and sharing the ip with other domain like kimsufi.com...)

I am not to sure if you can fix that - apart from changing your host

there might be other way - but strictly from a networking point of view that is what I could find, but I don't have much experience with that processing library.

you might be missing a /n also at the end of line 11

ponnuki.net

jean_np

Re: Networking issues

3 years ago

I see. Thank you for your answer, it makes sense.

It's a quite annoying issue as I can't change my host, it is a dedicated server on witch I have serveral domains

PhiLho

Re: Networking issues

3 years ago

400 is "bad request"
Indeed, your requests are not well formed: the end of line for these is \r\n (CR+LF):

c.write("GET /tests/chiffre.php HTTP/1.1\r\n");
c.write("Host: www.mywebsite.com\r\n\r\n");

I got a 404 there, so I suppose you just removed the PHP script.

jean_np

Re: Networking issues (kind of solved)

3 years ago

Thank you for the carriage return + line feed in the request, I shouldn't have forget that.

The script hadn't moved but now with this 404 error I've been able to verify what daramusama said upper : the request is done on the IP. So when I do this

c = new Client(this, "www.hyperbate.com", 80);
c.write("GET /tests/chiffre.php HTTP/1.1\r\n");
c.write("Host: www.mywebsite.com\r\n\r\n");

processing acts like if I asked for the IP corresponding to www.hyperbate.com, that is an IP shared by many domains.

It finaly worked with this :

c = new Client(this, "www.hyperbate.com", 80);
c.write("GET /~hyperbat/tests/chiffre.php HTTP/1.1\r\n");
c.write("Host: www.mywebsite.com\r\n\r\n");

... but www.hyperbate.com could have been replaced by the server's IP or maybe by any of the domains hosted on it.

The server's subdomains are written like this : /~hyperbat/ is the root document for www.hyperbate.com.

So thank you very much phi.lho and daramusama, I hope this will be useful to other people.

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