name: HTTP
purpose: Send browser HTTP requests with JSON, form, upload, timeout, and retained-header handling.

methods:
  request:
    signature: HTTP.request(options)
  get:
    signature: HTTP.get(options)
  post:
    signature: HTTP.post(options)
  put:
    signature: HTTP.put(options)
  delete:
    signature: HTTP.delete(options)
  head:
    signature: HTTP.head(options)

properties:
  keepHeaders: 'Header names retained from responses and injected into later requests. Default: [Session-Id, Device-Id].'

options:
  url: Required request URL.
  method: HTTP method. request defaults to POST.
  data: Object, string, ArrayBuffer, FormData, or HTMLFormElement.
  headers: Request headers.
  responseType: json, text, or binary. Defaults from Content-Type.
  timeout: Milliseconds. Default is 10000.

response:
  fields: [ok, status, headers, responseType, result, error]
  behavior: HTTP failures resolve with ok false and error. Transport failures also resolve with ok false.

rules:
  - Plain object request data is sent as JSON unless it contains File, Blob, or FileList values.
  - File-like values are converted to FormData.
  - Do not set Content-Type for FormData.
  - Session-Id and Device-Id response headers are retained by default; extend HTTP.keepHeaders to retain additional headers.

examples:
  get_json: |
    const response = await HTTP.get({ url: '/api/users' })
    if (response.ok) render(response.result)
  post_json: |
    const response = await HTTP.post({ url: '/api/users', data: { name: 'Ada' } })
  upload: |
    const response = await HTTP.post({ url: '/api/upload', data: document.querySelector('#form') })
  api_component: |
    <API id="usersApi" auto $.request="{ url: '/api/users', method: 'GET' }"></API>

tests:
  - HTTP.test.html