Use a GOPROXY for a specify path/domain

[Pierre Durand]

At my company we use an internal Go proxy in order to access private dependencies.

Our Go proxy manages the authentication to our dependencies repositories.

So my config looks like this:

GOPROXY='https://goproxy.mycompany.com,direct'

Unfortunately, our proxy is slightly slower than the public Go proxy for public dependencies (github, etc...)

So I would like to use the public Go proxy for public dependencies, and our internal Go proxy for private dependencies.

I changed my config to:

GOPROXY='https://proxy.golang.org,https://goproxy.mycompany.com,direct'

It works well, but I think it could cause a small privacy issue: it always send a query to the public Go proxy for our private dependencies.

Is it possible to use a specific Go proxy for a path/domain ?

Something like

GOPROXY='git.mycompany.com=https://goproxy.mycompany.com,https://proxy.golang.org,direct'

(I know this syntax doesn't work)

I think it would be very helpful to be able to configure a Go proxy for some domains/path.

[Jason E. Aten]

I think you might want GOPRIVATE

https://www.goproxy.io/docs/GOPRIVATE-env.html

[Pierre Durand]

Unfortunately I can't use GOPRIVATE for my company private dependencies, because I must use the internal proxy, in order to manage the authentication.

And I can't use GOPRIVATE for public dependencies, because:

- it would require to list all possible public providers (github, gitlab, bitbucket, other domains, etc...)

- it won't use the public proxy anymore, so it will be slower

My main problem is:

> Unfortunately, our proxy is slightly slower than the public Go proxy for public dependencies (github, etc...)

That's why I want to use different proxies

[David Finkel]

Unfortunately, no, I don't see a way to scope entries in the GOPROXY environment variable.

https://go.dev/ref/mod#environment-variables doesn't say anything about such scoping in the GOPROXY entry.

I don't see any facility in the parsing code (at master) either.

You may want to open an issue. (note: there are a lot that match "GOPROXY", so I"m not sure if there's an existing issue)

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