Added the ability to retrieve url from BaseResponse

[elmoiv]

No description provided.

[google-cla]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project (if not, look below for help). Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

📝 Please visit https://cla.developers.google.com/ to sign.

Once you've signed (or fixed any issues), please reply here with @googlebot I signed it! and we'll verify it.

---

What to do if you already signed the CLA

Individual signers

• It's possible we don't have your GitHub username or you're using a different email address on your commit. Check your existing CLA data and verify that your email is set on your git commits.

Corporate signers

• Your company has a Point of Contact who decides which employees are authorized to participate. Ask your POC to be added to the group of authorized contributors. If you don't know who your Point of Contact is, direct the Google project maintainer to go/cla#troubleshoot (Public version).
• The email used to register you as an authorized contributor must be the email used for the Git commit. Check your existing CLA data and verify that your email is set on your git commits.
• The email used to register you as an authorized contributor must also be attached to your GitHub account.

ℹ️ Googlers: Go here for more info.

[elmoiv]

@googlebot I signed it!

[kevmoo]

Add some documentation to the parameter and the field?

Why are you adding this? How does it help you?

[elmoiv]

It comes in handy when working with redirected urls. Like if I want to get the final retrieved URL after all redirects are done.

This adds the ability to get that from a http.get instead of the current workaround of setting followRedirects to false in http.Request or trying to check if response headers has the final url or not.

This was inspired from Python requests library

[elmoiv]

It appears that Dart CI Chrome tests are broken.

[natebosch]

If we are able to roll out this feature I think we'll use a Uri field instead of String. I'll pick this up in #699