Basic HTML version of Foils prepared 2 Sept 1997

Foil 11 Passing data as Standard Input to the CGI program

From CGI Programming with Advanced Topics Jackson State University Mississippi -- Fall Semester 97. by Nancy McCracken *
1 It is recommended to use a form with METHOD=POST to safely pass any amount of data through STDIN.
  • The CONTENT_LENGTH environment variable is set to the number of characters being sent, and the CONTENT_TYPE variable is set to "application/x-www-form-urlencoded".
  • The data is encoded by the server:
    • The fields are separated by the unencoded &.
    • Within each field, an unencoded = separates the fieldname input form and the data.
    • Spaces within a field are translated to +.
    • Certain other keyboard characters are encoded to %[hex equivalent] - for example, ! becomes %3D.
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