Support for calling gRPC endpoints from Cloudflare Workers

[VishalKaleria]

Hi team,

I'm working on a project using Cloudflare Workers and I need to call an external API that only supports gRPC (no REST or gRPC-Web fallback). I’ve discovered that Workers currently don’t support native gRPC calls due to the lack of support for full HTTP/2 streaming and low-level protocol handling.

It would be incredibly helpful to have first-class support for calling gRPC services from Workers, or at least a recommended/official workaround.

Why this matters:

• Many modern APIs (especially internal services or third-party backends) are moving to gRPC for performance and contract-based definitions.
• Cloudflare Workers are a perfect edge layer, but they currently can't integrate with many gRPC-only services.
• gRPC-Web isn't always available or sufficient depending on the API provider.

Potential directions:

• Support gRPC-Web in Workers (maybe via an internal wrapper or adapter).
• Allow Workers to establish gRPC-compatible HTTP/2 requests (including setting binary headers and trailers).
• Provide official guidance or example of proxying through a Worker + another layer (e.g. Envoy, Lambda, etc.).

Is there any plan for gRPC support on the roadmap? Or is this something the community could contribute toward?

Thanks for your amazing work; loving the developer experience overall.

[kentonv]

We've talked about this before. There might be a possibility of integrating with Cloudflare's existing gRPC pass-through support in such a way that we don't actually have to implement HTTP trailers in general.

But the work does need to be prioritized against a lot of other things.

@mikenomitch FYI I sent you some background details in an email.