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env GO111MODULE=on env sumdb=$GOSUMDB env proxy=$GOPROXY env GOPROXY GONOPROXY GOSUMDB GONOSUMDB # basic fetch (through proxy) works cp go.mod.orig go.mod go get rsc.io/fortune@v1.0.0 # note: must use test proxy, does not exist in real world rm $GOPATH/pkg/mod/cache/download/sumdb # rm sumdb cache but NOT package download cache rm go.sum # can fetch by explicit URL cp go.mod.orig go.mod env GOSUMDB=$sumdb' '$proxy/sumdb-direct go get rsc.io/fortune@v1.0.0 rm $GOPATH/pkg/mod/cache/download/sumdb rm go.sum # direct access fails (because localhost.localdev does not exist) # web.get is providing the error message - there's no actual network access. cp go.mod.orig go.mod env GOSUMDB=$sumdb env GOPROXY=direct ! go get rsc.io/fortune@v1.0.0 stderr 'verifying module: rsc.io/fortune@v1.0.0: .*: no such host localhost.localdev' rm $GOPATH/pkg/mod/cache/download/sumdb rm go.sum # proxy 404 falls back to direct access (which fails) cp go.mod.orig go.mod env GOSUMDB=$sumdb env GOPROXY=$proxy/sumdb-404 ! go get rsc.io/fortune@v1.0.0 stderr 'verifying.*localhost.localdev' rm $GOPATH/pkg/mod/cache/download/sumdb rm go.sum # proxy non-200/404/410 stops direct access cp go.mod.orig go.mod env GOSUMDB=$sumdb env GOPROXY=$proxy/sumdb-503 ! go get rsc.io/fortune@v1.0.0 stderr '503 Service Unavailable' rm $GOPATH/pkg/mod/cache/download/sumdb rm go.sum # the error from the last attempted proxy should be returned. cp go.mod.orig go.mod env GOSUMDB=$sumdb env GOPROXY=$proxy/sumdb-404,$proxy/sumdb-503 ! go get rsc.io/fortune@v1.0.0 stderr '503 Service Unavailable' rm $GOPATH/pkg/mod/cache/download/sumdb rm go.sum # if proxies are separated with '|', fallback is allowed on any error. cp go.mod.orig go.mod env GOSUMDB=$sumdb env GOPROXY=$proxy/sumdb-503|https://0.0.0.0|$proxy go get rsc.io/fortune@v1.0.0 rm $GOPATH/pkg/mod/cache/download/sumdb rm go.sum -- go.mod.orig -- module m