public THttpServiceBuilder defaultSerializationFormat(SerializationFormat defaultSerializationFormat) {
        requireNonNull(defaultSerializationFormat, "defaultSerializationFormat");
        this.defaultSerializationFormat = defaultSerializationFormat;
        return this;
    }
Adds the default serialization format which will be used when the client does not specify one in
request.

<p>Currently, the only way to specify a serialization format is by using the HTTP session
protocol and setting the {@code "Content-Type"} header to the appropriate
{@link SerializationFormat#mediaType()}.
thrift/thrift0.13/src/main/java/com/linecorp/armeria/server/thrift/THttpServiceBuilder.java