Debugging WebExtension's webRequest

webRequest.coffee

# https://developer.chrome.com/extensions/webRequest
listener = (label) -> (details) -> console.log label, details
[
  'onBeforeRequest'     # requestBody,     blocking
  'onBeforeSendHeaders' # requestHeaders,  blocking
  'onSendHeaders'       # requestHeaders
  'onHeadersReceived'   # responseHeaders, blocking
  'onAuthRequired'      # responseHeaders, blocking, asyncBlocking
  'onResponseStarted'   # responseHeaders
  'onBeforeRedirect'    # responseHeaders
  'onCompleted'         # responseHeaders
  'onErrorOccurred'
].forEach (event) ->
  chrome.webRequest[event].addListener listener(event),
    urls: [
      # URL (glob)
    ],
    [] # extra