[go-nuts] what does the "replace" in go.mod mean?

[T L]

I host a package on github: https://github.com/go101/tinyrouter
And I decided to use "go101.org/tinyrouter" as its import path.

Then in a program which import the package:

// main.go
package main

import (
    _ "go101.org/tinyrouter"
)

func main() {
}

// go.mod
module app

replace go101.org/tinyrouter => github.com/go101/tinyrouter v1.0.0

When I build it, it reports errors:

$ go build -v -x
WORK=/tmp/go-build304435862
Fetching https://go101.org/tinyrouter?go-get=1
Parsing meta tags from https://go101.org/tinyrouter?go-get=1 (status code 
404)
Fetching https://go101.org?go-get=1
Parsing meta tags from https://go101.org?go-get=1 (status code 200)
build a.b/app: cannot find module for path go101.org/tinyrouter

The go command still connect to https://go101.org?
Shouldn't it connect github.com instead?

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