Re: How can i get the value from a simple html form using ruby?

Ultimately, it all boils down to text messages being passed across the web.
Those requests are in a certain format (HTTP) that the servers then parse
to extract the relevant information.

For example, start up irb and run:
> require 'socket'
> server = TCPServer.new 2000
> client = server.accept

Now go in a new tab and run (assuming you're on linux)
$ curl http://localhost:2000/abc?def=hijkl

Then back to the irb console, and type `client.gets` until you see the
"\r\n" message (if you go too far, ctrl-C)
> client.gets
 => "GET /abc?def=hijkl HTTP/1.1\r\n"

> client.gets
 => "User-Agent: curl/7.21.4 (universal-apple-darwin11.0) libcurl/7.21.4
OpenSSL/0.9.8r zlib/1.2.5\r\n"

> client.gets
 => "Host: localhost:2000\r\n"

> client.gets
 => "Accept: */*\r\n"

> client.gets
 => "\r\n"

You can see the data there (this is a GET request, you can see by the first
word of the first line). After this last "\r\n" is the body, which we don't
have since we made a GET request (if you posted a form, you would have more
content here).

Now write some stuff back:

> client.puts "hello"
> client.puts "there"
> client.puts "curl!"

And you'll see it come out in the curl output.
Then run

> client.close

and the curl session will end.

Real http responses, of course, are formatted as well, and consumers like
curl and web browsers will parse and interpret them, but this should show
you how they actually talk to each other.

(If you don't have curl, you can make this request in a web browser)

-Josh
On Tue, Jun 12, 2012 at 7:31 PM, gmspro gmspro <[e-mail]> wrote:

> What does cinatra or other framework do to get the value in this format?
> puts params[:fname]
>
> How is it done by those frameworks? What do they manage that to get the
> value from form post?
>
> --
> Posted via http://www.ruby-forum.com/.
>
>