default void cacheContentType(final String key, final MediaType mediaType, final long timeoutSeconds) {
        cacheData(key, mediaTypeToBytes(mediaType), timeoutSeconds).subscribeOn(Schedulers.boundedElastic()).subscribe();
    }
cache the content type.
@param key the key
@param mediaType the media type
@param timeoutSeconds value valid time
shenyu-plugin/shenyu-plugin-cache/shenyu-plugin-cache-spi/src/main/java/org/apache/shenyu/plugin/cache/ICache.java