Traffic: [Status 0] - The status provided (0) is outside the range [200, 599]

[JeanDamien]

Description

If the user uses a .har file that contained a resource blocked by the browser (or adblocker) with a 0 status , this package will throw an exception:

Uncaught (in promise) RangeError: Failed to construct 'Response': The status provided (0) is outside the range [200, 599].
    at toResponse (@mswjs_source_traffic.js)
    at fromTraffic (@mswjs_source_traffic.js)

https://github.com/mswjs/source/blob/main/src/traffic/utils/har-utils.ts#L40

Reproduction steps

• Go to your favorite website, ie: https://source.mswjs.io/ with the network tab open
• Chose a resource and block it (Right click => Block request URL)
• Clean the network log and refresh
• The resource should be blocked

• Export the logs as HAR file
• Try to generate the request handlers following the instructions

HAR file

test/traffic/fixtures/archives/entry-with-status-0.har

Test template

  // Happen when the resource is blocked by the browser
  it(
    'does not throw an exception given an HAR file with a 0 status entry',
    () => {
      const traffic = readArchive(
        'test/traffic/fixtures/archives/entry-with-status-0.har',
      )
      expect(() => fromTraffic(traffic)).not.toThrow()
    },
  )

Expected behavior

It would be ideal if the library didn't throw an exception, or if we could add an entry in the documentation advising users to filter those entries in HAR before using it.

Workaround

fromTraffic(traffic, (entry) => {
  if (entry.response.status === 0) {
    return
  }
  return entry
})

[weyert]

Ah interesting. Never thought of this. The error appears to come from the Response-class itself, we probably want to add your fix into the code base.

[kettanaito]

Released: v0.3.1 🎉

This has been released in v0.3.1!

• 📄 Release notes
• 📦 npm package

Make sure to always update to the latest version (npm i @mswjs/source@latest) to get the newest features and bug fixes.

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