ProviderBaseURL requires a PORT, even if the destination port in 80

[individual-it]

• OS: Ubuntu 20.04
• webserver of provider: Apache2
• Consumer Pact library: pact-node 10.10.1
• Provider Pact library: pact-go v1.4.4
• Golang Version: 1.13.1
• Golang environment:

GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/artur/.cache/go-build"
GOENV="/home/artur/.config/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/artur/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/home/artur/www/ocis-hello/go.mod"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build158496793=/tmp/go-build -gno-record-gcc-switches"

Expected behaviour

when ProviderBaseURL does not contain a port, don't add : in the HTTP request

Actual behaviour

when ProviderBaseURL does not contain a port, : are added in the Host field of the HTTP request

GET /owncloud-core/ocs/v1.php/cloud/user HTTP/1.1
Host: localhost:
User-Agent: Pact Go
Authorization: Basic YWRtaW46YWRtaW4=
Cookie: 
Origin: http://localhost:9876
X-Forwarded-For: 127.0.0.1, 127.0.0.1
Accept-Encoding: gzip

Steps to reproduce

1. create a provider test, but don't give any PORT in the ProviderBaseURL
2. run the tests

example code:

package pact

import (
	"crypto/tls"
	"fmt"
	"github.com/pact-foundation/pact-go/types"
	"log"
	"github.com/pact-foundation/pact-go/dsl"
	"path/filepath"
	"testing"
)

func TestProviderContract(t *testing.T) {
	// Create Pact connecting to local Daemon
	pact := &dsl.Pact{
		LogLevel: "DEBUG",
		Provider: "oc-server",
	}

	pactDir := "/home/artur/www/owncloud-sdk/tests/pact"

	// Verify the Provider using the locally saved Pact Files
	_, err := pact.VerifyProvider(t, types.VerifyRequest{
		ProviderBaseURL: "http://localhost/owncloud-core/",
		PactURLs:        []string{filepath.ToSlash(fmt.Sprintf("%s/owncloud-sdk-oc-server.json", pactDir))},
		FailIfNoPactsFound: true,
		CustomTLSConfig:  &tls.Config{InsecureSkipVerify: true},
	})

	if err != nil {
		log.Fatalf("%v", err)
	}
}

Relevent log files

Please ensure you set logging to DEBUG and attach any relevant log files here (or link from a gist).