JumpStart to the Web technologies tutorial: CGI

From: Subject: JumpStart to the Web technologies tutorial: CGI - Common Gateway Interface Date: Thu, 14 Nov 2002 10:48:00 +0100 MIME-Version: 1.0 Content-Type: multipart/related; boundary="----=_NextPart_000_000E_01C28BCB.4CD95A50"; type="text/html" X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 This is a multi-part message in MIME format. ------=_NextPart_000_000E_01C28BCB.4CD95A50 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Content-Location: http://www.sergey.com/web_course/part_5.html JumpStart to the Web technologies tutorial: CGI - = Common Gateway Interface

Jumpstart into=20 the Web technologies:	<- Prev.	Start	Contents	References	Home	Next=20 ->

CGI=20 - Common Gateway Interface

Overview=20
Receiving= =20 the input=20
Producin= g the=20 output=20
Keeping=20 the state between the sessions=20
Environment= =20 variables=20
Form=20 tags reference

The Common Gateway Interface (CGI) is a standard for interfacing = external=20 applications with information servers, such as HTTP or Web servers. A = plain HTML=20 document that the Web daemon retrieves is static, which = means it=20 exists in a constant state: a text file that doesn't change. A CGI = program, on=20 the other hand, is executed in real-time, so that it can output=20 dynamic information.=20

Simple diagram of how CGI is working:
=20

Basically it's very simple:=20

User enters the input on his Web browser into the form = (<FORM> tag)=20
Browser packs the input according to the CGI specifications and = sends it=20 to the URL, which is specified in ACTION field of the = FORM.=20 It's actually sent to the HTTP server.=20
Server extracts the program name from the URL and calls the = program,=20 passing the packed user input to the program as well.=20
Server takes the output (standard output) of the program and = passes it=20 back to the browser.

So basically in our CGI program we need to know how to do two things: = first,=20 take the user's input & unpack, so we can use it and, second, figure = out=20 what to print to stdout, so broswer will understand.=20

Getting the user's = input
There are two=20 methods (METHOD parameter of the FORM tag) of = passing=20 parameters to CGI program:=20

POST - If form uses this method all the data is = send to=20 CGI program's stdin.=20
GET - If this method is in use, data is passed to = the=20 program using the environment variables (QUERY_STRING). This is the = method,=20 which is used, when CGI program is called by URL with appended encoded = parameters (e.g. /cgi-bin/prog.cgi?aaa=3Dbb&xxx=3Dyyy). =

Note, that if=20 METHOD is not specified, the default is GET.
In most of the = cases=20 POST method should be used, because it't more flexible and also, there = is a high=20 probability, that while using GET method, long input will be = truncated.
GET=20 method is useful if you want to create a URL link to some CGI program = and pass=20 some parameters (you just append them to the URL with '?' = character).=20 Just don't forget to encode all the special characters (space is encoded = with=20 '+'), but most of the CGI libraries have functions to do the = encoding=20 for you.
In both cases, the content of the form will be encoded in = the=20 following form: name=3Dvalue&name=3Dvalue&name=3Dvalue =
Most=20 likely, you won't have to deal with encoding & decoding, because = it's a good=20 idea to use some CGI library. In case of Perl it would be = CGI.pm, which=20 comes with standard perl distribution.=20

Producing the output and sending it = back to the=20 client
The output of CGI program consists of two parts: = header &=20 body. The delimiter between the header and body is an empty = string.
The body=20 is usually a simple HTML page, created by the program. It can also be = any other=20 type of thing, like image or binary document, but in most cases it'll be = HTML.=20

Here is the list of valid HTTP headers:=20

Content-type - The MIME content type of the output = stream.=20
Content-length - The length (in bytes) of the output = stream. Need=20 for binary data.=20
Expires - Date and time when the document is no longer = valid and=20 should be reloaded by the browser. Also used by search engines.=20
Location - Server redirection, means, that insted of this = document server should redirect the browser to another document (the = one,=20 which URL is in the Location header). Since this type of = header=20 redirects browser to another place, everything, that is send in the = stream=20 after this header will be ignored.=20
Pragma - Turns document caching on and off. Usually for = CGI=20 programs you want it off.=20
Status - Status of the request. e.g. 404 (Document not = found)=20
Refresh - Also type of redirect, which allows to specify = the=20 refresh time, so if for example it's set to 5, client will see your = document=20 for 5 seconds and then will be redirected to another one.=20
Set-Cookie - Sets the cookie in the browser.

The minimal thing you'll need to do in your CGI program is to produce = Content-type header.e.g.:

#!/usr/local/bin/perl
print "Content-type: text/html\n\n";
print "<HTML>\n";
print "<HEAD><TITLE>Hello =
world!</TITLE></HEAD>\n";
print "<BODY><H1>Hello world!</H1></BODY>\n";
print "</HTML>\n";

Keeping the state (session) between the = CGI=20 calls
Since it's typical client-server model, to produce each = screen,=20 a new process should be started on the server. Which means, that there = is no way=20 for this process to know what happened in the previous one.
There are = some=20 techniques, that allow you to keep some info between the sessions:=20

Hidden fields in the form (<INPUT TYPE=3DHIDDEN = NAME=3Dname=20 VALUE=3Dvalue>) Using these fields, you can embed information = into a=20 form that the user won't see, but which will be sent to the CGI = program when=20 the form is submitted.=20
Cookies - This is a mechanism, which allows to store some = info in=20 the browser. Each cookie has the following fields:=20
- hostname - Hostname (if set to .company.com applies for = all=20 hostnames inside company.com domain). This is the hostname of the = server to=20 which this cookie applies. Browser will not send this cookie to any = other=20 host.=20
- name - Name of the cookie.=20
- value - Value of the cookie.=20
- Exp. date - Expiration date. Date when this cookie = expires. if=20 not set, cookie expires, when the browser exits. =

The List of environment variables, used = by=20 CGI:

GATEWAY_INTERFACE - The revision of the CGI that the = server uses.=20
SERVER_NAME - The server's hostname or IP address.=20
SERVER_SOFTWARE - The name and version of the server = software=20 that is answering the client request.=20
SERVER_PROTOCOL - The name and revision of the = information=20 protocol the request came in with.=20
SERVER_PORT - The port number of the host on which the = server is=20 running.=20
PATH_INFO - Extra path information passed to a CGI = program.=20
PATH_TRANSLATED - The translated version of the path = given by the=20 variable PATH_INFO.=20
SCRIPT_NAME - The virtual path (e.g., /cgi-bin/prog.cgi) = of the=20 CGI program being executed.=20
DOCUMENT_ROOT - The directory from which Web documents = are=20 served.=20
REQUEST_METHOD - The method with which the information = request=20 was issued.=20
QUERY_STRING - The form content passed to the program. = This=20 appended to the GET method only.=20
CONTENT_TYPE - The MIME type of the query data, e.g. = "text/html".=20
CONTENT_LENGTH - The length of the data (in bytes) passed = to the=20 CGI program through standard input (POST method).=20
REMOTE_HOST - The remote hostname of the user's host.=20
REMOTE_ADDR - The remote IP address of the user's host.=20
AUTH_TYPE - The authentication method used to validate a = user.=20
REMOTE_USER - The authenticated name of the user.=20
REMOTE_IDENT - The user making the request. This variable = will=20 only be set if ident daemon is running on user's machine and we can't = trust it=20 anyway :-).=20
HTTP_ACCEPT - A list of the MIME types that the client = can=20 accept.=20
HTTP_USER_AGENT - The browser the client is using to = issue the=20 request. Useful if you want to do different things with netscape and = IE or to=20 find out the version of the browser.=20
HTTP_REFERER - The URL of the document that the browser = pointed=20 to before accessing the CGI program.

Possible Form tags (quick = reference):=20 =

Form Tag Look Description

<FORM ACTION=3D"/cgi-bin/prog.cgi"=20 METHOD=3D"POST">
Begin of the form

<INPUT TYPE=3D"text" NAME=3D"name" = VALUE=3D"value"=20 SIZE=3D"size"> Text field

<INPUT TYPE=3D"password" NAME=3D"name" = VALUE=3D"value"=20 SIZE=3D"size"> Password field

<INPUT TYPE=3D"hidden" NAME=3D"name"=20 VALUE=3D"value"> Hidden field

<INPUT TYPE=3D"checkbox" NAME=3D"name"=20 VALUE=3D"value1"> Checkbox

<INPUT TYPE=3D"radio" NAME=3D"name"=20 VALUE=3D"value1"> <INPUT TYPE=3D"radio" NAME=3D"name"=20 VALUE=3D"value2"> Radio button

<SELECT NAME=3D"name" = SIZE=3D1> <OPTION=20 VALUE=3D"1" SELECTED>Choice1 <OPTION=20 VALUE=3D"2">Choice2 </SELECT> Menu

<SELECT NAME=3D"name" SIZE=3Dn=20 MULTIPLE> <OPTION=20 = SELECTED>Choice1 <OPTION>Choice2 </SELECT> Scrolled list

<TEXTAREA ROWS=3Dyy COLS=3Dxx = NAME=3D"name"> some text=20 . </TEXTAREA> some text . Multiline text fields

<INPUT TYPE=3D"submit"=20 VALUE=3D"Message"> <INPUT TYPE=3D"submit" NAME=3D"name"=20 VALUE=3D"value"> <INPUT TYPE=3D"image" = SRC=3D"images/submit.gif"=20 NAME=3D"name" VALUE=3D"value">

Submit buttons

<INPUT TYPE=3D"reset" = VALUE=3D"Message"> Reset button

</FORM> Ends form

Form Tag	Look	Description
`<FORM ACTION=3D"/cgi-bin/prog.cgi"=20 METHOD=3D"POST">`		Begin of the form
`<INPUT TYPE=3D"text" NAME=3D"name" = VALUE=3D"value"=20 SIZE=3D"size">`		Text field
`<INPUT TYPE=3D"password" NAME=3D"name" = VALUE=3D"value"=20 SIZE=3D"size">`		Password field
`<INPUT TYPE=3D"hidden" NAME=3D"name"=20 VALUE=3D"value">`		Hidden field
`<INPUT TYPE=3D"checkbox" NAME=3D"name"=20 VALUE=3D"value1">`		Checkbox
`<INPUT TYPE=3D"radio" NAME=3D"name"=20 VALUE=3D"value1"> <INPUT TYPE=3D"radio" NAME=3D"name"=20 VALUE=3D"value2">`		Radio button
`<SELECT NAME=3D"name" = SIZE=3D1> <OPTION=20 VALUE=3D"1" SELECTED>Choice1 <OPTION=20 VALUE=3D"2">Choice2 </SELECT>`		Menu
`<SELECT NAME=3D"name" SIZE=3Dn=20 MULTIPLE> <OPTION=20 = SELECTED>Choice1 <OPTION>Choice2 </SELECT>`		Scrolled list
`<TEXTAREA ROWS=3Dyy COLS=3Dxx = NAME=3D"name"> some text=20 . </TEXTAREA>`	some text .	Multiline text fields
`<INPUT TYPE=3D"submit"=20 VALUE=3D"Message"> <INPUT TYPE=3D"submit" NAME=3D"name"=20 VALUE=3D"value"> <INPUT TYPE=3D"image" = SRC=3D"images/submit.gif"=20 NAME=3D"name" VALUE=3D"value">`		Submit buttons
`<INPUT TYPE=3D"reset" = VALUE=3D"Message">`		Reset button
`</FORM>`		Ends form

Note: All values should be in double quotes! Now = it's=20 working without it, but next year it will not! XML doesn't allow it, = it's much=20 more strict.=20

Summary:
Now we can receive user's input and do = something=20 with it. There are some pluses and some minuses with CGI:=20

Pluses:

You can use any of your favorite programming languages, the most = common is=20 Perl, but it can be C, C++, Shell script etc. etc.=20
Another nice thing is, that each request runs the process again, = so if you=20 have a bug in your program it will not crash the whole system, in the = worst=20 case scenario user will receive an error, but for the next user it can = work=20 fine (if the rest of the system is fine).

Minuses:

Because it starts the process again and again, and it takes some = time, to=20 fire the process, the performance is not that good. It becomes = especially=20 problematic if you need to work with RDBMS, since each time you need = to open a=20 database connection, and this can take a lot of time. Application = servers,=20 which are doing database connection pooling can help here.=20
It's inconvenient and complicated to keep the states between the = requests=20 and you have to save these states on the client side, which can be a = security=20 problem sometimes. This one is also solved in the Application servers. =
Each time we need to process this data, we need to go to the HTTP = server=20 and create a new connection. So if the connection is relatively slow = it's very=20 inconvenient. We need to be able to do some simple processing on the = browser=20 side to save the connection times. Here helps JavaScript...

More info on CGI can be found here<= /I>.=20

Jumpstart into=20 the Web technologies: <- Prev. Start Contents References Home Next=20 ->

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bold; FONT-SIZE: = x-large; PADDING-BOTTOM: 7pt; COLOR: navy; PADDING-TOP: 10pt; = TEXT-ALIGN: center } .title2 { PADDING-RIGHT: 4pt; PADDING-LEFT: 4pt; FONT-WEIGHT: bold; FONT-SIZE: = x-large; PADDING-BOTTOM: 7pt; COLOR: navy; PADDING-TOP: 10pt; = TEXT-ALIGN: center; TEXT-DECORATION: underline } P { PADDING-RIGHT: 5pt; PADDING-LEFT: 5pt; PADDING-BOTTOM: 7pt; = PADDING-TOP: 7pt } ------=_NextPart_000_000E_01C28BCB.4CD95A50 Content-Type: application/octet-stream Content-Transfer-Encoding: quoted-printable Content-Location: http://www.sergey.com/web_course/navig.js =0A= // Navigation function to go to the next / previous page=0A= // n is offset (1, -1 etc.)=0A= function goto_page (n) {=0A= var first =3D 0;=0A= var last =3D 14; // should be the next after the last one=0A= var part_name =3D "part_";=0A= var loc =3D window.location.href;=0A= var re =3D /(.*)\/(\w+)\.html([^\/]*)$/;=0A= var ra =3D re.exec(loc);=0A= =0A= // may be it ends with '/' instead of index.html=0A= if (ra =3D=3D null) {=0A= ra =3D re.exec(loc + "index.html");=0A= }=0A= var path =3D ra[1];=0A= var fname =3D ra[2]; =0A= =0A= // alert("=3D=3D" + ra[1] + "=3D=3D" + ra[2] + "=3D=3D" + ra[3]);=0A= =0A= if (n !=3D -1 && n !=3D 1) {=0A= alert("Hmmm... 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