What was actually broken before
VPC Network and VPC Service bindings let a Worker reach resources inside a private network Cloudflare’s platform connects to. Before wrangler@4.115.0, wrangler dev had no path to actually open that connection locally, so any test or code path exercising .connect() on one of these bindings either had to be skipped in local dev, mocked out entirely, or only ever verified after a real deploy, which defeats a large part of the point of local development in the first place.
The changelog entry, from cloudflare/workers-sdk’s packages/wrangler/CHANGELOG.md, wrangler@4.115.0 (released 2026-07-28):
“Support
connect()on remote VPC Network and VPC Service bindings in local development”
The word “remote” is doing real work in that sentence: this isn’t a fully offline local simulation the way Miniflare’s default R2 or KV stores are. The local dev session actually reaches the real, deployed VPC resource, which is a meaningfully different testing story than a purely local mock.
Structural Comparison Matrix
| Operational Aspect | Before (v4.114.0 and earlier) | After (v4.115.0+) |
|---|---|---|
.connect() on VPC bindings locally | Not supported; had to stub or skip | Works, reaching the real remote resource |
| Where verification happened | Only after a real deploy | Available during local wrangler dev |
| Nature of the local connection | N/A | Remote, not a fully offline simulation |
Fix it: remove the old workaround
Search for the workaround before assuming it's gone
If a previous developer added a stub, a mock, or a conditional that skips VPC
binding calls specifically during local dev, it was very likely added because
of this exact gap. Grep the codebase for comments or conditionals referencing
VPC bindings and local dev, confirm the real .connect() call works now, and
remove the workaround rather than leaving a dead code path that silently
diverges from what local dev now actually does.
wrangler --version
# needs wrangler 4.115.0 or laterConfirmed version
Sourced from cloudflare/workers-sdk’s packages/wrangler/CHANGELOG.md, wrangler@4.115.0, released 2026-07-28. This wasn’t independently reproduced against a real VPC Network or VPC Service resource here, since this site’s own Worker doesn’t use VPC bindings; the changelog entry is the primary source. Browse more posts like this in the Dev Tools archive.
