Native HTTP breadcrumb dedup never matches requests that have a query string #6872

Versions

@sentry/react-native 8.30.0, @sentry/core 10.76.0, sentry-cocoa 9.30.1 (bundled), React Native 0.86.3, Expo 57, iOS 27 simulator.

What happens

Every API request that has a query string shows up twice in an event's breadcrumbs: once from the JS XHR instrumentation and once from the native iOS network tracker.

deviceContextIntegration already tries to remove these duplicates (deduplicateNativeHttpBreadcrumbs in integrations/devicecontext.js). It matches a native breadcrumb to a JS one by method, status, a 2 second time window, and an exact comparison of data.url. The URL comparison never matches when there is a query string:

• the JS breadcrumb's data.url is the full URL including ?query
• the native breadcrumb's data.url has no query; the query is stored separately in data["http.query"]

We also saw the host casing and a trailing slash differ between the two in some cases, which defeats the exact comparison as well.

Steps to reproduce

1. iOS app with default integrations (enableNetworkBreadcrumbs defaults to on).
2. Make any request whose URL has a query string, e.g. GET https://api.example.com/posts?page=1.
3. Capture an error and look at its breadcrumbs: the request appears twice, one xhr and one http breadcrumb.

What we did

We changed the URL comparison in the dedupe to compare a normalized form of both URLs: query string and fragment removed, scheme and host lowercased, trailing slash removed. After that each request appears once. Requests without a query string were already deduplicated correctly, so they are unaffected.