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OC-Minitel/FRequest/FRequest-protocol.md

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# FRequest - Simple file transfer protocol - Revision 1
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FRequest is a simple file transfer protocol for use on Minitel or similar networks.
## Requests
A client request consists of the following:
- A single-character request type
- The path for the file the client is requesting
- A newline
Request types can be the following characters:
- t - **t**ransfer - request file contents
- s - **s**tat - request file size and type (format: (d or f)<size>)
## Server responses
The server should respond with:
- A single character status code
- The result of the request
Status codes can be the following characters:
- y - **y**es - file found, read and sent
- d - **d**irectory - directory listing sent
- n - **n**ot found - no such file or directory
- f - **f**ailure - other type of failure, reason sent
## Example exchange
1. The client initiates a connection to the server on the FRequest port (default 70)
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2. The client sends *t* to ask for a transfer, the path *example.txt*, and a newline.
3. The server finds the file and responds with *y* followed by the file contents.
4. The server closes the connection when the transfer is completed.
Servers may wish to implement restricting users to a specific directory.