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Client/Browser Requests |
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The PxPlus Web Server addresses two forms of browser requests:
Requests contain a header block terminated by a blank line and can also (optionally) contain a data block known as the body. Each line of information sent to or from a web server or browser ends in a CRLF terminator (i.e. carriage return plus line feed: $0D0A$).
URL Request to GET a File
URL Request to Run a PxPlus Program
Merge Dynamic Data with HTML Templates (*web/merge)
Appendix - HTML Examples
Three methods or types of requests are described as follows:
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Method |
Description |
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GET |
Most common method. Typically used for files and small CGI requests. It contains the name of the file being requested and (optionally) can include command line arguments or a short variable list. There is no body information, just a header. The size limit is typically about 100 characters. |
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POST |
Typically used for data from forms or for large CGI requests. POSTS can contain body information in addition to the header block. Parameters (command line arguments, variables) are relegated to the body of the request. |
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HEAD |
Typically used by a browser or URL validator to check the validity of a request without receiving data. HEAD requests are handled like GET requests, except that only the HTTP Header will be returned. No HTTP Body is actually sent. |
The main difference between the GET and POST methods is in the amount of information you want to pass in the request. Use the GET method for simple URL requests. There is a limit of about 100 characters when you are passing parameters (arguments, variables, etc.) in your URL request.
If you want to pass large amounts of information, use the POST method instead. Use the POST method in your HTML pages.
Example:
In the example Orders Web Page 1 - login.htm in the section
Appendix - HTML Examples:
<td><form method="POST" action="/orders/webord;logon">
Example 1 - This example illustrates the GET method in a file request from MS Internet Explorer 5 (IE5):
GET /mypage.htm HTTP/1.1
Accept: application/vnd.ms-excel, application/msword, application/vnd.ms-powerpoint, image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, */*
Accept-Language: en-us
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 5.0b2; Windows 98) Host: 127.0.0.1
Connection: Keep-Alive
Example 2 - This example is a URL request to GET a file:
http://www.pvxplus.com:3000/support/home.htm