Google HTTP Client for Java: Set a NetHttpTransport Proxy

Configure the NetHttpTransport passed to a Google Java HTTP client instead of changing an unused client object.

A Google API client can receive an HTTP transport when it is constructed. Configure the transport that the client will actually use, rather than building a separate proxied HTTP client beside it.

For the Java-net transport, the builder exposes an explicit proxy option:

Proxy proxy = new Proxy(Proxy.Type.HTTP,
    new InetSocketAddress("203.0.113.10", 8080));
HttpTransport transport = new NetHttpTransport.Builder()
    .setProxy(proxy)
    .build();

The address is illustrative; the HTTP proxy list supplies candidates for a permitted public HTTP route. Pass this transport to the API client's supported construction path. Check the exact builder and dependency version used in the application; another backend has its own configuration interface.

The proxy option selects the route. API credentials and proxy authentication remain separate. If the connection fails before the API receives a request, replacing the API token cannot repair the missing proxy route.

A framework may construct its own transport internally. Locate that construction point when a standalone example works but the application's API call does not.

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