Adds support for use in GOPROXY

[greeddj]

Hello

This PR adds support for loading golang modules by specifying a hub service as GOPROXY.

export GOPROXY=http://localhost:6587/goproxy/golang

The implemented functionality in general follows the guidelines described in the official Go module proxy protocol: https://go.dev/ref/mod#goproxy-protocol.

Here are some examples

➜ http http://localhost:6587/goproxy/golang/github.com/russross/blackfriday/v2/@v/list
HTTP/1.1 200 OK
Accept-Ranges: bytes
Content-Length: 34
Content-Type: text/plain; charset=utf-8
Date: Sun, 07 Dec 2025 17:53:30 GMT
Last-Modified: Sun, 07 Dec 2025 17:53:30 GMT
Server: hub/dev (601a6353726c0622b609179cf1b0697906e5cd9c)
X-Cache-Status: MISS

v2.0.0
v2.1.0-pre.1
v2.1.0
v2.0.1


➜ http http://localhost:6587/goproxy/golang/github.com/russross/blackfriday/v2/@latest
HTTP/1.1 200 OK
Accept-Ranges: bytes
Content-Length: 50
Content-Type: application/json
Date: Sun, 07 Dec 2025 17:53:38 GMT
Last-Modified: Sun, 07 Dec 2025 17:50:06 GMT
Server: hub/dev (601a6353726c0622b609179cf1b0697906e5cd9c)
X-Cache-Status: HIT

{
    "Time": "2020-10-27T03:47:54Z",
    "Version": "v2.1.0"
}


➜ http http://localhost:6587/goproxy/golang/github.com/russross/blackfriday/v2/@v/v2.1.0.info
HTTP/1.1 200 OK
Accept-Ranges: bytes
Content-Length: 50
Content-Type: application/json
Date: Sun, 07 Dec 2025 17:54:08 GMT
Last-Modified: Sun, 07 Dec 2025 17:54:08 GMT
Server: hub/dev (601a6353726c0622b609179cf1b0697906e5cd9c)
X-Cache-Status: MISS

{
    "Time": "2020-10-27T03:47:54Z",
    "Version": "v2.1.0"
}


➜ http http://localhost:6587/goproxy/golang/github.com/russross/blackfriday/v2/@v/v2.1.0.mod
HTTP/1.1 200 OK
Accept-Ranges: bytes
Content-Length: 42
Content-Type: text/plain; charset=utf-8
Date: Sun, 07 Dec 2025 17:54:24 GMT
Last-Modified: Sat, 07 Nov 2020 22:42:11 GMT
Server: hub/dev (601a6353726c0622b609179cf1b0697906e5cd9c)
X-Cache-Status: MISS

module github.com/russross/blackfriday/v2


➜ http http://localhost:6587/goproxy/golang/github.com/russross/blackfriday/v2/@v/v2.1.0.zip
HTTP/1.1 200 OK
Accept-Ranges: bytes
Content-Length: 122358
Content-Type: application/zip
Date: Sun, 07 Dec 2025 17:55:35 GMT
Last-Modified: Sat, 07 Nov 2020 22:42:11 GMT
Server: hub/dev (601a6353726c0622b609179cf1b0697906e5cd9c)
X-Cache-Status: HIT



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Also:

• Updated README.md
• Updated go version and depth

Let me know if any adjustments are needed.

[psvmcc]

LGFM, thank you!