Robustify WebSocketHttpHeaders.java getSecWebSocketExtensions ?

in https://github.com/spring-projects/spring-framework/commit/81dda069af4289395b85a6649b272b39372eb968#diff-44e75080977bfba2cfa41722ac8e0345a7ffd0bbab3893610554d2904b7935ebR102-R142

getSecWebSocketExtensions is changed from return List to List with a new parser.

It's an edge case but this custom parsing doesn't handle quotes on parameter values, just mentionning it in passing, feel free to close if appropriate

/**
	 * Parse the given, comma-separated string into a list of {@code WebSocketExtension} objects.
	 * <p>This method can be used to parse a "Sec-WebSocket-Extension" extensions.
	 * @param extensions the string to parse
	 * @return the list of extensions
	 * @throws IllegalArgumentException if the string cannot be parsed
	 */
	public static List<WebSocketExtension> parseExtensions(String extensions) {
		if (extensions == null || !StringUtils.hasText(extensions)) {
			return Collections.emptyList();
		}
		else {
			List<WebSocketExtension> result = new ArrayList<WebSocketExtension>();
			for(String token : extensions.split(",")) {
				result.add(parseExtension(token));
			}
			return result;
		}
	}

	private static WebSocketExtension parseExtension(String extension) {
		Assert.doesNotContain(extension, ",", "Expected a single extension value: " + extension);
		String[] parts = StringUtils.tokenizeToStringArray(extension, ";");
		String name = parts[0].trim();

		Map<String, String> parameters = null;
		if (parts.length > 1) {
			parameters = new LinkedHashMap<String, String>(parts.length - 1);
			for (int i = 1; i < parts.length; i++) {
				String parameter = parts[i];
				int eqIndex = parameter.indexOf('=');
				if (eqIndex != -1) {
					String attribute = parameter.substring(0, eqIndex);
					String value = parameter.substring(eqIndex + 1, parameter.length());
					parameters.put(attribute, value);
				}
			}
		}

		return new WebSocketExtension(name, parameters);
	}

Start in WebSocketHttpHeaders.java at getSecWebSocketExtensions and the parseExtensions parser shown in the issue. Review how parameter values are extracted, then verify behavior for quoted values in WebSocket extension headers. Done means quoted parameter values are handled correctly without regressing existing extension parsing.