Basic HTML version of Foils prepared 11 May 1997

Foil 10 Passing data as Standard Input to the CGI program

From Introduction to CGI Programming ECS400 Spring 97 Senior Undergraduate Course -- Spring Semester 97. by Nancy J. McCracken *
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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