oonimkall.HTTPRequest.URL is not passed properly from iOS

[aanorbel]

Clash Between Go Conventions and iOS Compatibility:

• Go typically uses all uppercase for acronyms (e.g., "URL") as described in the code review comments: https://go.dev/wiki/CodeReviewComments#initialisms.
• However, this convention creates issues with iOS development, as shown in this pull request: https://github.com/golang/mobile/pull/50 .

The Problem: Using "URL" in Go code breaks compatibility with iOS because iOS expects lowercase property names.

Possible Solution: Consider renaming the property to "Url" (lowercase) to match iOS expectations. This would sacrifice some consistency with Go conventions but ensure better compatibility.