Programming Articles - Page 3248 of 3366

in apache server normally python script will not run. SO you have to go httpd.conf file in apache server, inside that you will find some .php, .asp etc in a property called AddHandler, you have to put there .py. save the file and restart the server. then run your python CGI script, it will run properly 

Configure Apache Web server for CGITo get your server run CGI scripts properly, you have to configure your Web server. We will discuss how to configure your Apache web server to run CGI scripts.Using ScriptAliasYou may set a directory as ScriptAlias Directive (options for configuring Apache). This way, Apache understands that all the files residing within that directory are CGI scripts. This may be the most simple way to run CGI Scripts on Apache. A typical ScriptAlias line looks like following in httpd.conf file of your Apache web server.ScriptAlias /cgi-bin/ /usr/local/apache2/cgi-bin/So, search ScriptAlias in your httpd.conf file and uncomment the ... Read More

To upload a file, the HTML form must have the enctype attribute set to multipart/form-data. The input tag with the file type creates a "Browse" button.Example        File:         OutputThe result of this code is the following form −File: Choose file UploadHere is the script save_file.py to handle file upload −#!/usr/bin/python import cgi, os import cgitb; cgitb.enable() form = cgi.FieldStorage() # Get filename here. fileitem = form['filename'] # Test if the file was uploaded if fileitem.filename:    # strip leading path from file name to avoid    # directory traversal attacks   ... Read More

Retrieving CookiesIt is very easy to retrieve all the set cookies. Cookies are stored in CGI environment variable HTTP_COOKIE and they will have following form −key1 = value1;key2 = value2;key3 = value3....Here is an example of how to retrieve cookies.#!/usr/bin/python # Import modules for CGI handling from os import environ import cgi, cgitb if environ.has_key('HTTP_COOKIE'):    for cookie in map(strip, split(environ['HTTP_COOKIE'], ';')):       (key, value ) = split(cookie, '=');       if key == "UserID":          user_id = value       if key == "Password":          password = value print ... Read More

Setting up CookiesIt is very easy to send cookies to browser. These cookies are sent along with HTTP Header before to Content-type field. Assuming you want to set UserID and Password as cookies. Setting the cookies is done as follows −#!/usr/bin/python print "Set-Cookie:UserID = XYZ;\r" print "Set-Cookie:Password = XYZ123;\r" print "Set-Cookie:Expires = Tuesday, 31-Dec-2007 23:12:40 GMT;\r" print "Set-Cookie:Domain = www.tutorialspoint.com;\r" print "Set-Cookie:Path = /perl;" print "Content-type:text/html\r\r" ...........Rest of the HTML Content....From this example, you must have understood how to set cookies. We use Set-Cookie HTTP header to set cookies.It is optional to set cookies attributes like Expires, Domain, and Path. ... Read More

Using Cookies in CGIHTTP protocol is a stateless protocol. For a commercial website, it is required to maintain session information among different pages. For example, one user registration ends after completing many pages. How to maintain user's session information across all the web pages?In many situations, using cookies is the most efficient method of remembering and tracking preferences, purchases, commissions, and other information required for better visitor experience or site statistics.How Cookies workYour server sends some data to the visitor's browser in the form of a cookie. The browser may accept the cookie. If it does, it is stored as ... Read More

GET and POST MethodsYou must have come across many situations when you need to pass some information from your browser to web server and ultimately to your CGI Program. Most frequently, browser uses two methods two pass this information to web server. These methods are GET Method and POST Method.Passing Information using GET methodThe GET method sends the encoded user information appended to the page request. The page and the encoded information are separated by the ? character as follows −http://www.test.com/cgi-bin/hello.py?key1=value1&key2=value2The GET method is the default method to pass information from browser to web server and it produces a long ... Read More

HTTP HeaderThe line Content-type:text/html\r\r is part of HTTP header which is sent to the browser to understand the content. All the HTTP header will be in the following form −HTTP Field Name − Field ContentFor ExampleContent-type − text/html\r\rThere are few other important HTTP headers, which we will use frequently in our CGI Programming.     Sr.No.HeaderDescription1Content-type:A MIME string defining the format of the file being returned. Example is Content-type:text/html2Expires: DateThe date the information becomes invalid. It is used by the browser to decide when a page needs to be refreshed. A valid date string is in the format 01 Jan 1998 ... Read More

If we run simple scripts like hello.py, its output is written on the STDOUT file, i.e., screen. There is one important and extra feature available which is the first line to be printed Content-type:text/html\r\r. This line is sent back to the browser and it specifies the content type to be displayed on the browser screen.We can write advanced CGI programs using Python. This script can interact with any other external system and even exchange information with RDBMS.

Python's cgi module is usually the starting place in writing CGI programs in Python. The main purpose of the cgi module is to extract the values passed to a CGI program from an HTML form. Mostly one interacts with CGI applications through an HTML form. One fills out some values in the form that specify details of the action to be performed, then call on the CGI to perform its action using your specifications.You may include many input fields within an HTML form which can be of a number of different types (text, checkboxes, picklists, radio buttons, etc.).Your Python script ... Read More