It's unclear from the documentation whether values like Bundle.entry.transaction.url and Bundle.entry.transaction.ifNoneMatch take values that are:

• Absolute URLs

• URLs relative to base (including a leading "/')

• URLs realative to base (excluding a leading "/")

(Or if all three are fine, or if it depends on whether Bundle.base itself has a trailing slash.)

We see examples of leading slash (http://hl7-fhir.github.io/http.html#2.1.0.13.1), no leading slash (http://hl7-fhir.github.io/bundle-transaction.xml.html).

I think it would help to clarify that all of these fields are interpreted relative to Bundle.base, and so the combination of :

Bundle.base: "http://example.com/base"
Bundle.entry.transaction.url: "Patient"

woudld be illegal (it would need a "/" at the end of base, or at the beginning of transaction.url). The bundle documentation should be updated accordingly (and the examples).