Network Error Logging Support

[tuberd]

• [* ] I've read, understood, and done my best to follow the *CONTRIBUTING guidelines.

What did you do?

NEL (network error logging) is not supported in AlamoFire.

What did you expect to happen?

Clients using AlamoFire should be able to submit NEL reports using the Report-To header in HTTP. This means understanding network failures on the device such as TCP timeouts, resets, aborts, TLS certificate failures, DNS failures, and protocol failures.

What happened instead?

Mobile clients that want to use Network Error Logging cannot upload network error reports to targeted endpoints.

Alamofire Environment

Alamofire version: all
Xcode version: all
Swift version: all
Platform(s) running Alamofire: all
macOS version running Xcode: all

Demo Project

As this is a new feature, any project will reproduce the issue.

[jshier]

While it's unlikely we'd actually support the NEL standard (it's complex and seems to be of rather limited utility), an analysis of what would be need for support outside Alamofire itself would be a good idea to guide future development.

[tuberd]

Hey jon, thanks for responding. If someone were to build support for this, would it be something you would be willing to accept upstream?

[jshier]

Probably not. Enabling it as an external library would be our goal.

[tuberd]

So as a library that you can load into Alamofire? Makes sense.