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"We are excited to share that we are ready for developers to start alpha testing our module mirror, index, and checksum database!"


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Hey Gophers!


In the blog post Go Modules in 2019, we announced our intent to provide a module mirror for accelerating Go module downloads, an index for discovering new modules, and a checksum database for authenticating module content. We are excited to share that we are ready for developers to start alpha testing our module mirror, index, and checksum database! Our privacy policy explains how we collect and use your information. The privacy policy for all of these services is proxy.golang.org/privacy.


The module mirror at proxy.golang.org serves the go command’s proxy protocol. To make the go command use it (when in module mode), set GOPROXY=https://proxy.golang.org. The module index at index.golang.org serves a feed of module versions in the order they are discovered. For example, see https://index.golang.org/index?since=2019-03-04T18:00:15.161182-07:00


The module checksum database at sum.golang.org serves the URLs described in the Secure the Public Go Module Ecosystem proposal. If you use the Go 1.13 development version of the go command, setting GOPROXY=https://proxy.golang.org will automatically use the checksum database as well. To use the checksum database to protect other code downloads, set GOSUMDB=sum.golang.org explicitly. See the development version g


We hope you’ll try out these new services! Note that these are in the early stages, so even though we don’t have any planned outages, you should recognize it is an alpha release and instability and bugs are expected. We’ll be actively working through these and improving our services, so please file issues if you spot them, with the title prefix “proxy.golang.org:” (or index.golang.org, or sum.golang.org). We look forward to hearing about how it’s working for you!



Katie Hockman




"This is not the end, it is not even the beginning of the end, but it is perhaps the end of the beginning."



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