Simple Common Gateway Interface (SCGI)

Created: 2021-01-30T17:23:13-06:00

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Encoding

• Headers and values are terminated with NULL (00.)
• All keys and values are concatenated together.
• This bundle is encoded as a netstring.

Rules:

• The first header/value pair must be CONTENT_LENGTH.
• The value of CONTENT_LENGTH is written in decimal.
• A header/value pair of SCGI and 1 must be present.
• The same key cannot be present more than once.

Example

Content-Type: application/x-blobcat
Content-Length: 6
Henlo.

First the headers are flattened:

CONTENT_LENGTH <00> 6 <00>
CONTENT-TYPE <00> application/x-blobcat <00>

Then wrapped in a netstring:

68:CONTENT_LENGTH<00>6<00>CONTENT-TYPE<00>application/x-blobcat<00>,

And the content of the message follows:

68:CONTENT_LENGTH<00>6<00>CONTENT-TYPE<00>application/x-blobcat<00>,
Henlo.

Response

An SCGI client sends the raw response including HTTP or Gemini headers and closes the socket.

Netstrings