Encode a request header into the given writer.
The header version is determined automatically from the API key and version, or can be overridden via headerVersion.
headerVersion
The writer to encode into.
Request header fields.
Optional
Override the header version (defaults to auto-detection).
Encode a request header into the given writer.
The header version is determined automatically from the API key and version, or can be overridden via
headerVersion.