Whether this converter should convert messages for which no content type
could be resolved through the configured
{@link hunt.stomp.converter.ContentTypeResolver}.
<p>A converter can configured to be strict only when a
{@link #setContentTypeResolver contentTypeResolver} is configured and the
list of {@link #getSupportedMimeTypes() supportedMimeTypes} is not be empty.
<p>When this flag is set to {@code true}, {@link #supportsMimeType(MessageHeaders)}
will return {@code false} if the {@link #setContentTypeResolver contentTypeResolver}
is not defined or if no content-type header is present.
Whether this converter should convert messages for which no content type could be resolved through the configured {@link hunt.stomp.converter.ContentTypeResolver}. <p>A converter can configured to be strict only when a {@link #setContentTypeResolver contentTypeResolver} is configured and the list of {@link #getSupportedMimeTypes() supportedMimeTypes} is not be empty. <p>When this flag is set to {@code true}, {@link #supportsMimeType(MessageHeaders)} will return {@code false} if the {@link #setContentTypeResolver contentTypeResolver} is not defined or if no content-type header is present.