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- // Copyright 2018 Google LLC
- //
- // Licensed under the Apache License, Version 2.0 (the "License");
- // you may not use this file except in compliance with the License.
- // You may obtain a copy of the License at
- //
- // http://www.apache.org/licenses/LICENSE-2.0
- //
- // Unless required by applicable law or agreed to in writing, software
- // distributed under the License is distributed on an "AS IS" BASIS,
- // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- // See the License for the specific language governing permissions and
- // limitations under the License.
-
- package metadata_test
-
- import (
- "net/http"
-
- "cloud.google.com/go/compute/metadata"
- )
-
- // This example demonstrates how to use your own transport when using this package.
- func ExampleNewClient() {
- c := metadata.NewClient(&http.Client{Transport: userAgentTransport{
- userAgent: "my-user-agent",
- base: http.DefaultTransport,
- }})
- p, err := c.ProjectID()
- if err != nil {
- // TODO: Handle error.
- }
- _ = p // TODO: Use p.
- }
-
- // userAgentTransport sets the User-Agent header before calling base.
- type userAgentTransport struct {
- userAgent string
- base http.RoundTripper
- }
-
- // RoundTrip implements the http.RoundTripper interface.
- func (t userAgentTransport) RoundTrip(req *http.Request) (*http.Response, error) {
- req.Header.Set("User-Agent", t.userAgent)
- return t.base.RoundTrip(req)
- }
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