My Web Page

in VS .NET Painting QR-Code in VS .NET My Web Page

My Web Page

<html><head> <title>My Web Page</title></head> <body><h1>My Web Page</h1></body> </html> in VS .NET

Painting QR-Code in VS .NET <html><head> <title>My Web Page</title></head> <body><h1>My Web Page</h1></body> </html>
<html><head> <title>My Web Page</title></head> <body><h1>My Web Page</h1></body> </html>
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the Web client really receives this:
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HTTP/11 200 OK Date: Wed, 20 Dec 2000 23:41:38 GMT Server: Apache/1314 (Unix) mod_perl/121 PHP/4011 X-Powered-By: PHP/4011 Connection: close Content-Type: text/html <html><head> <title>My Web Page</title></head> <body><h1>My Web Page</h1></body> </html>
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Apache typically adds the header, which consists of all the lines of text before the HTML, when it serves a static Web page CGI scripts must provide their own headers At minimum, they must provide a ContentType line A CGI script that wants to produce a simple Hello World! must actually produce:
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Content-type: text/plain Hello World!
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Failure to add proper headers is a common mistake of new CGI programmers Also, there absolutely must be a blank line between the Content-Type line and the Hello World! line
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Example CGI Scripts
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The following scripts demonstrate some of the basics of CGI programming They progress from extremely simple to mildly involved Although they use the bash shell to serve their content, they could be written in any language that Linux executes, as long as the scripts produce exactly the same output
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Hello World!
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The following shell script produces a simple Hello World! on the screen:
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#!/bin/sh # helloworldtxtsh -- write Hello World as a CGI script, in text echo Content-type: text/plain echo echo Hello, World!
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Because the Content-Type was text/plain, the script was produced in plain text, as shown in Figure 25 A common scripting mistake is to forget to leave NO space after the end of the text/plain line and have the second echo on a separate line
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A simple, plain-text Hello, World! CGI script in plain text
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Here is the same script, changed to HTML and with markup added (see Figure 26):
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#!/bin/sh # helloworldhtmlsh -- write Hello World as a CGI script, in HTML echo content-type: text/html echo '<head><title>Hello, World!</title></head>' echo '<body bgcolor="#FFFFFF"><h1>Hello, World!</h1></body></html>'
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The quotes around the text in this example are there for a reason: the comma (,) and exclamation point (!) characters are reserved characters in shell parlance and would cause confusion if they were not quoted
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Just as a normal process inherits the environment from its parent, a shell script inherits the environment from Apache It also receives several other variables Use the set command to show this:
#!/bin/sh # setsh - show the environment in a CGI script echo Content-type: text/plain echo set
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A simple, HTML Hello, World! CGI script in HTML
Many of these variables are useful in determining what kind of output is sent back to the browser This information is also very useful for a cracker trying to break into a Web server; consequently, this is not a script to leave on a Web server once it goes into production
Form Handler
Many times a CGI script needs input data from the browser to determine what type of information to send back; for instance, a Web mail client would need to know the username of the person for which it displays mail Two common methods of passing data to CGI forms exist: the GET method and the POST method The GET method sends data after a question mark on the request URI, such as wwwtestcom/cgi-bin/test abcd The script named test, in the cgi-bin directory of wwwtestcom was given the data abcd The GET method is used in HTML input forms, when the type is not specified or when the type is GET Because the information is passed in the URL, it can be keyed into a browser by hand, without accessing a Web page with an <INPUT> tag The GET method also typically has a limit of 1,024 characters, and the data is URL encoded (spaces are changed to pluses,
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some characters are changed to their hexadecimal representation, and so on) The data is entered in the variable QUERY_STRING, which becomes part of the CGI script s environment The POST method, on the other hand, gives data directly to the Web server The URL requested by the browser does not have a question mark ( ) appended to it, nor is the data sent limited to 1,024 characters The data is encoded in URL form, but Apache decodes it before sending it to the CGI program The CGI script must read the CONTENT_LENGTH environment variable to determine the length of the incoming data, as no EOF is sent on this stream Consider the following CGI script:
#!/bin/sh # hish - say hi to the CGI script echo Content-type: text/plain echo if [ "$QUERY_STRING" = "hi" ]; then echo You said hi! else echo You did not say hi! echo Please say hi fi
When called with a $QUERY_STRING of "hi", it will respond with You said hi!(See Figure 27) Otherwise, it will respond with You did not say hi Please say hi (See Figure 28)