Differences between CGI/1.0 and 1.1

Here's a brief summary of what has changed between CGI/1.0 and CGI/1.1.

All headers output by a nph-script which have no special meaning to the server are sent to the client.
There is a new output header, Status, which corresponds to the HTTP/1.0 status code and reason string to be sent to the client.
The header lines recieved from the client, if any, are placed into the environment with the prefix HTTP_ followed by the header name. Any - characters in the header name are changed to _ characters. The server may exclude any headers which it has already processed, such as Authorization, Content-type, and Content-length. If necessary, the server may choose to exclude any or all of these headers if including them would exceed any system environment limits.