CS 314 Lab 1. Exploring HTTP 
HW by Tom Barstow. 
Due: 5/19 5 PM
Submitted @ 1:30 PM on 5/18
A Word Format Version Exists as lab1.doc
==========================================
Manual HTTP Requests

In the in-class exercise, you established a telnet connection to a web server and issued HTTP commands manually. 
Using the same procedure, issue the requests shown below and then answer the questions.

#1 Issue a GET request for www.bgsu.edu/hidden.html using HTTP/1.1 
#2 Issue a HEAD request for www.bgsu.edu/index.html using HTTP/1.1 
#3 Repeat #2 using HTTP/1.0 
#4 Issue a HEAD request for index.html from www.ebay.com using HTTP/1.1. 
#5 Issue a GET request for the same resource as #4. 
	See Log Attached At End For Verification.
==========================================
Questions:

What was the response code for request #1 above?
	400.

How did the server responses to #2 and #3 compare? 
	#2 (HTTP/1.1) returned a code of 400 (status code for a bad request), 
	but #3 (HTTP/1.0) returned a code of 403 (which is the status code for forbidden... )

What is the Content-length from request #4?
	4009

How does the server response to request #4 differ from its response to request #5 ?
(both request the same resource).
	In #4 & #5 it returns the code 400 (status code for a bad request), 
	but the difference in the servers response to our requests is that #4 
	does not include the entity body (because the HEAD command was used) 
	where as in #5 the GET command is used so an entity body is returned (ie. HTML is returned).
==========================================
Client Requests.

The above examples use simplified GET and HEAD requests. Most browsers send additional information to the server. 
While we can see the server's responses (as illustrated above) we can't see the actual request. 
However, an 'echo' server running on port 2020 on voyager was designed to simply echo back whatever it receives. 
Thus by typing the URL below into a browser, we can see exactly what how the browser forms its requests. 
Using Microsoft Internet Explorer (MSIE), issue a GET request for the following resource:

http://voyager.cs.bgsu.edu:2020/index.html
==========================================
List the HTTP request issued by MSIE verbatim.

GET /index.html HTTP/1.1
Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*
Accept-Language: en-us
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322)
Host: voyager.cs.bgsu.edu:2020
Connection: Keep-Alive

What version of HTTP did MSIE use to formulate the request?
1.1

What is MSIE's user-agent string?
Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322)
==========================================
Repeat the above experiment for Netscape Navigator (NN).
	GET /index.html HTTP/1.0
	Connection: Keep-Alive
	User-Agent: Mozilla/4.08 [en] (WinNT; I ;Nav)
	Host: voyager.cs.bgsu.edu:2020
	Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, image/png, */*
	Accept-Encoding: gzip
	Accept-Language: en
	Accept-Charset: iso-8859-1,*,utf-8

What version of HTTP did NN use to formulate the request?
1.0 (I used NN 4.08 found on browsers.evolt.org)

What is NN's user-agent string?
	Mozilla/4.08 [en] (WinNT; I ;Nav)
==========================================
POST Method
Using the method described in Ch. 2 of Web Client Programming, issue a POST request for resource

http://webapps.bgsu.edu/cgi-bin/bgsuform/test3

with the following entity-body:

mailTo=gzimmer%40bgnet.bgsu.edu&mailFrom=gzimmer%40bgnet.bgsu.edu 
but replace my username with your username.

List the exact POST request used to retrieve this resource.
POST /cgi-bin/bgsuform/test3 HTTP/1.0
Referer: http://www.cs.bgsu.edu
Connection: Keep-Alive
User-Agent: Mozilla/3.0Gold (WinNT; I)
Host: webapps.bgsu.edu
Accept: */*
Content-type: application/x-www-form-urlencoded
Content-length: 65

mailTo=barstoc%40bgnet.bgsu.edu&mailFrom=barstoc%40bgnet.bgsu.edu

List the exact response received from the server. 
HTTP/1.1 200 OK
Date: Wed, 18 May 2005 16:56:08 GMT
Server: Apache/1.3.26 (Unix) mod_jk mod_ssl/2.8.10 OpenSSL/0.9.7-beta3 PHP/4.2.3
Connection: close
Content-Type: text/html

<html>
<head>
<title>BGSU Forms</title>
</head>

<body bgcolor="#ffffff">

<h1>BGSU Forms</h1>

<p>Thank you for using BGSU Forms!</p>

<p>The following information was submitted:</p>

<ul>
<li><b>mailTo</b>: barstoc@bgnet.bgsu.edu
<li><b>mailFrom</b>: barstoc@bgnet.bgsu.edu
</ul>

<p>This is <em>only</em> a test!</p>
<hr>
<a href="mailto:webmaster@bgnet.bgsu.edu">webmaster@bgnet.bgsu.edu</a>

</body>
</html>
==========================================
Hints: Read the reference given above. 
Also: look over Test #3 from the inclass exercise sheet. 
Turn in: Write your answers in a plain text file called lab1.txt. 
Include your name and "Lab 1" at the top of the file. 
Make sure that your answers are well organized.
Save your file in your home directory on voyager. 




















==========================================
Attached Log:

Sun Microsystems Inc.   SunOS 5.8       Generic February 2000
voyager% tcsh
> telnet www.bgsu.edu 80
Trying 129.1.2.175...
Connected to www.bgsu.edu.
Escape character is '^]'.
GET /hidden.html HTTP/1.1

HTTP/1.1 400 Bad Request
Date: Tue, 17 May 2005 17:05:22 GMT
Server: Apache/1.3.28 (Unix)
Connection: close
Transfer-Encoding: chunked
Content-Type: text/html; charset=iso-8859-1

132
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<HTML><HEAD>
<TITLE>400 Bad Request</TITLE>
</HEAD><BODY>
<H1>Bad Request</H1>
Your browser sent a request that this server could not understand.<P>
client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23): /hidd
en.html<P>
</BODY></HTML>

0

Connection closed by foreign host.
>telnet www.bgsu.edu 80
Trying 129.1.2.175...
Connected to www.bgsu.edu.
Escape character is '^]'.
HEAD /index.html HTTP/1.1

HTTP/1.1 400 Bad Request
Date: Tue, 17 May 2005 17:19:47 GMT
Server: Apache/1.3.28 (Unix)
Connection: close
Content-Type: text/html; charset=iso-8859-1

Connection closed by foreign host. 
> !t
telnet www.bgsu.edu 80
Trying 129.1.2.175...
Connected to www.bgsu.edu.
Escape character is '^]'.
HEAD /index.html HTTP/1.0

HTTP/1.1 403 Forbidden
Date: Tue, 17 May 2005 17:08:00 GMT
Server: Apache/1.3.28 (Unix)
Connection: close
Content-Type: text/html; charset=iso-8859-1

Connection closed by foreign host.
> telnet www.ebay.com 80
Trying 66.135.208.89...
Connected to hp-core.ebay.com.
Escape character is '^]'.
HEAD /index.html HTTP/1.1

HTTP/1.1 400 Bad Request
Server: Microsoft-IIS/5.0
Date: Tue, 17 May 2005 17:10:29 GMT
Connection: close
Content-Length: 4009
Content-Type: text/html

Connection closed by foreign host.
> !t
telnet www.ebay.com 80
Trying 66.135.208.89...
Connected to hp-core.ebay.com.
Escape character is '^]'.
GET /index.html HTTP/1.1

HTTP/1.1 400 Bad Request
Server: Microsoft-IIS/5.0
Date: Tue, 17 May 2005 17:12:09 GMT
Connection: close
Content-Length: 4009
Content-Type: text/html

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<html dir=ltr>

<head>
<style>
a:link			{font:8pt/11pt verdana; color:FF0000}
a:visited		{font:8pt/11pt verdana; color:#4e4e4e}
</style>

<META NAME="ROBOTS" CONTENT="NOINDEX">

<title>The page cannot be found</title>

<META HTTP-EQUIV="Content-Type" Content="text-html; charset=Windows-1252">
</head>

<script> 
function Homepage(){
<!--
// in real bits, urls get returned to our script like this:
// res://shdocvw.dll/http_404.htm#http://www.DocURL.com/bar.htm 

	//For testing use DocURL = "res://shdocvw.dll/http_404.htm#https://www.m
icrosoft.com/bar.htm"
	DocURL=document.URL;
	
	//this is where the http or https will be, as found by searching for ://
 but skipping the res://
	protocolIndex=DocURL.indexOf("://",4);
	
	//this finds the ending slash for the domain server 
	serverIndex=DocURL.indexOf("/",protocolIndex + 3);

	//for the href, we need a valid URL to the domain. We search for the # s
ymbol to find the begining 
	//of the true URL, and add 1 to skip it - this is the BeginURL value. We
 use serverIndex as the end marker.
	//urlresult=DocURL.substring(protocolIndex - 4,serverIndex);
	BeginURL=DocURL.indexOf("#",1) + 1;
	urlresult=DocURL.substring(BeginURL,serverIndex);
		
	//for display, we need to skip after http://, and go to the next slash
	displayresult=DocURL.substring(protocolIndex + 3 ,serverIndex);
	InsertElementAnchor(urlresult, displayresult);
}

function HtmlEncode(text)
{
    return text.replace(/&/g, '&amp').replace(/'/g, '&quot;').replace(/</g, '&lt
;').replace(/>/g, '&gt;');
}

function TagAttrib(name, value)
{
    return ' '+name+'="'+HtmlEncode(value)+'"';
}

function PrintTag(tagName, needCloseTag, attrib, inner){
    document.write( '<' + tagName + attrib + '>' + HtmlEncode(inner) );
    if (needCloseTag) document.write( '</' + tagName +'>' );
}

function URI(href)
{
    IEVer = window.navigator.appVersion;
    IEVer = IEVer.substr( IEVer.indexOf('MSIE') + 5, 3 );

    return (IEVer.charAt(1)=='.' && IEVer >= '5.5') ?
        encodeURI(href) :
        escape(href).replace(/%3A/g, ':').replace(/%3B/g, ';');
}

function InsertElementAnchor(href, text)
{
    PrintTag('A', true, TagAttrib('HREF', URI(href)), text);
}

//-->
</script>

<body bgColor="FFFFFF">

<table width="410" cellpadding="3" cellspacing="5">
  
	<td align="left" valign="middle" width="360">
	<h1 style="COLOR:000000; FONT: 13pt/15pt verdana"><!--Problem-->The page
 cannot be found</h1>
    </td>
  </tr>
  
  <tr>
    <td width="400" colspan="2">
	<font style="COLOR:000000; FONT: 8pt/11pt verdana">The page you are look
ing for might have been removed, had its name changed, or is temporarily unavail
able.</font></td>
  </tr>
  
  <tr>
    <td width="400" colspan="2">
	<font style="COLOR:000000; FONT: 8pt/11pt verdana">

	<hr color="#C0C0C0" noshade>
	
    <p>Please try the following:</p>

	<ul>
      <li>If you typed the page address in the Address bar, make sure that it is
 spelled correctly.</li>
	  
      <li>Open the

	  <script language="JavaScript"> 
	  <!--
	  if (!((window.navigator.userAgent.indexOf("MSIE") > 0) && (window.navigator.appVersion.charAt(0) == "2")))
	  {
	  	Homepage();
	  }
	  -->
	  </script>

	  home page, and then look for links to the information you want.</li>
	  
		 <li>Click the
		 <a href="javascript:history.back(1)">
		 Back</a> button to try another link.</li>
    </ul>
	
    <h2 style="COLOR:000000; FONT: 8pt/11pt verdana">HTTP 400 - Bad Request<br>
    Internet Information Services</h2>

	<hr color="#C0C0C0" noshade>
	
	<p>Technical Information (for support personnel)</p>
	
<ul>
<li>More information:<br>
<a href="http://www.microsoft.com/ContentRedirect.asp?prd=iis&sbp=&pver=5.0&pid=
&ID=400&cat=web&os=&over=&hrd=&Opt1=&Opt2=&Opt3=" target="_blank">Microsoft Supp
ort</a>
</li>
</ul>

    </font></td>
  </tr>

</table>
</body>
</html>
Connection closed by foreign host.
>