s2s

srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
	fmt.Printf("%s\n", r.Header.Get("Signature"))
	w.WriteHeader(http.StatusOK)
}))
defer srv.Close()

tr := New(WithTransport(http.DefaultTransport), WithActor(jdoeActor, prv), NoRFC9421)

// The below functionality would be equivalent to the following usage:
//http.DefaultClient.Transport = tr
//res, err := http.Get(srv.URL)

req := httptest.NewRequest(http.MethodGet, srv.URL, nil)
host := strings.TrimPrefix(srv.URL, "http://")
host = host[:strings.Index(host, ":")]
req.Header.Set("Host", host)
req.Header.Set("Date", millenium.Format(http.TimeFormat))
_, _ = tr.RoundTrip(req)

Output:
keyId="https://example.com/~johndoe#main",algorithm="hs2019",headers="(request-target) host",signature="RhsET77hrToaCyh/2++dFw0PGn64AoZBR3X2r+rVFWDT1CtobC1sVwXcc91v2c2HmB3A6P3EH1truRnhbNpL2sOgmqUbkRGBoO5afsgaRzRg/z8BwKDlnP9w/6zYlvoYH2VcgQpCTKPUkYDGUexFQDxBJMFime+d361I3ptO/Jc="

srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
	verifier, _ := httpsig.NewVerifier(
		mockKeyResolver{},
		httpsig.WithNonceChecker(mockNonceChecker(true)),
		httpsig.WithValidateAllSignatures(),
		httpsig.WithValidityTolerance(time.Hour),
		httpsig.WithMaxAge(time.Hour),
	)

	err := verifier.Verify(httpsig.MessageFromRequest(r))
	if err != nil {
		fmt.Printf("Verification failed: %s\n", err)
	} else {
		fmt.Printf("Verification succeeded\n")
	}
	w.WriteHeader(http.StatusOK)
}))
defer srv.Close()

tr := New(WithTransport(http.DefaultTransport), WithActor(&exActorRSA, prvKeyRSA), WithAlg(KeyTypePKCS), WithNonce(sameNonce))
req := httptest.NewRequest(http.MethodPost, srv.URL, strings.NewReader(`{"hello": "world"}`))
req.Header.Set("Host", "example.com")
req.Header.Set("Date", millenium.Format(http.TimeFormat))
req.Header.Set("Content-Type", "application/json")
req.Header.Set("Content-Length", "18")

_, _ = tr.RoundTrip(req)

Output:
Verification succeeded