Do not try to parse bodies for HEAD requests

Signed-off-by: Josh Soref <2119212+jsoref@users.noreply.github.com>

pkg/cmd/api/api.go

@@ -463,9 +463,11 @@ func processResponse(resp *http.Response, opts *ApiOptions, bodyWriter, headersW
 
 	var serverError string
 	if isJSON && (opts.RequestPath == "graphql" || resp.StatusCode >= 400) {
-		responseBody, serverError, err = parseErrorResponse(responseBody, resp.StatusCode)
-		if err != nil {
-			return
+		if !strings.EqualFold(opts.RequestMethod, "HEAD") {
+			responseBody, serverError, err = parseErrorResponse(responseBody, resp.StatusCode)
+			if err != nil {
+				return
+			}
 		}
 	}
 

pkg/cmd/api/api_test.go

@@ -1234,6 +1234,35 @@ func Test_apiRun_DELETE(t *testing.T) {
 	}
 }
 
+func Test_apiRun_HEAD(t *testing.T) {
+	ios, _, _, _ := iostreams.Test()
+
+	err := apiRun(&ApiOptions{
+		IO: ios,
+		Config: func() (gh.Config, error) {
+			return config.NewBlankConfig(), nil
+		},
+		HttpClient: func() (*http.Client, error) {
+			var tr roundTripper = func(req *http.Request) (*http.Response, error) {
+				return &http.Response{
+					StatusCode: 422,
+					Request:    req,
+					Header: map[string][]string{
+						"Content-Type": {"application/json"},
+					}}, nil
+			}
+			return &http.Client{Transport: tr}, nil
+		},
+		MagicFields:         []string(nil),
+		RawFields:           []string(nil),
+		RequestMethod:       "HEAD",
+		RequestMethodPassed: true,
+	})
+	if err != cmdutil.SilentError {
+		t.Fatalf("got error %v", err)
+	}
+}
+
 func Test_apiRun_inputFile(t *testing.T) {
 	tests := []struct {
 		name          string