Read Write HTTP

A small Janet library to make reading and writing HTTP/1.1 streams easier. With Janet's built-in net library, you can write terse HTTP code without a large framework.

Install

jpm install https://github.com/m7andrew/read-write-http

Examples

A minimal server:

(use http)

(def response
  {:status 200
   :headers {"Content-Type" "text/plain"}
   :body "Hello World"})

(defn handler [stream]
  (pp (read/request stream))
  (write/response stream response)
  (net/close stream))

(net/server "localhost" 8000 handler)

Send a request:

(use http)

(def request
  {:method "GET"
   :uri "/imghp"
   :headers {"Host" "www.google.com"}})

(def stream (net/connect "www.google.com" 80))
(write/request stream request)
(pp (read/response stream))
(net/close stream)

Functions

Read Request

(read/request stream)

Reads a stream for a request. Returns a request as a struct with the following fields:

• :method string, the HTTP method.
• :path string, the URI path.
• :query struct, the URI query paramaters. If no query, field is omitted.
• :headers struct, the HTTP headers.
• :body string, the request body. If no body, field is omitted.

Returns nil if no request could be read.

Read Response

(read/response stream)

Reads a stream for a response. Returns a response as a struct with the following fields:

• :status number, the HTTP status code.
• :headers struct, the HTTP headers.
• :body string, the HTTP body. If no body, field is omitted.

Returns nil if no response could be read.

Write Request

(write/request stream request)

Write a request to a stream where request is a struct or table with the following fields:

• :method string, the HTTP method. Optional. Defaults to "GET".
• :uri string, the HTTP URI. Optional. Defaults to "/".
• :headers struct or table, the HTTP headers. "Host" is required.
• :body string, the HTTP body. Optional.

Returns nil, or raises an error if the write failed.

Write Response

(write/response stream response)

Write a response to a stream where response is a struct or table with the following fields:

• :status number, the HTTP status code. Optional. Defaults to 200
• :headers struct or table, the HTTP headers. Optional. "Content-Length" is automatically set.
• :body string, the HTTP body. Optional.

Returns nil, or raises an error if the write failed.