jodd-servlet/src/main/java/jodd/servlet/filter/GzipFilter.java
protected boolean isGzipEligible(final HttpServletRequest request) {
		// request parameter name

		if (requestParameterName.length() != 0) {
			String forceGzipString = request.getParameter(requestParameterName);

			if (forceGzipString != null) {
				return Converter.get().toBooleanValue(forceGzipString, false);
			}
		}

		// extract uri

		String uri = request.getRequestURI();

		if (uri == null) {
			return false;
		}

		uri = uri.toLowerCase();

		boolean result = false;

		// check uri

		if (matches == null) {					// match == *
			if (extensions == null) {			// extensions == *
				return true;
			}
			// extension
			String extension = FileNameUtil.getExtension(uri);

			if (extension.length() > 0) {
				extension = extension.toLowerCase();

				if (StringUtil.equalsOne(extension, extensions) != -1) {
					result = true;
				}
			}
		} else {
			if (wildcards) {
				result = Wildcard.matchPathOne(uri, matches) != -1;
			} else {
				for (String match : matches) {
					if (uri.contains(match)) {
						result = true;
						break;
					}
				}
			}
		}

		if ((result) && (excludes != null)) {
			if (wildcards) {
				if (Wildcard.matchPathOne(uri, excludes) != -1) {
					result = false;
				}
			} else {
				for (String exclude : excludes) {
					if (uri.contains(exclude)) {
						result = false;						// excludes founded
						break;
					}
				}
			}
		}

		return result;
	}
protected boolean isGzipEligible(final HttpServletRequest request) {
		// request parameter name

		if (requestParameterName.length() != 0) {
			String forceGzipString = request.getParameter(requestParameterName);

			if (forceGzipString != null) {
				return Converter.get().toBooleanValue(forceGzipString, false);
			}
		}

		// extract uri

		String uri = request.getRequestURI();

		if (uri == null) {
			return false;
		}

		uri = uri.toLowerCase();

		boolean result = false;

		// check uri

		if (matches == null) {					// match == *
			if (extensions == null) {			// extensions == *
				return true;
			}
			// extension
			String extension = FileNameUtil.getExtension(uri);

			if (extension.length() > 0) {
				extension = extension.toLowerCase();

				if (StringUtil.equalsOne(extension, extensions) != -1) {
					result = true;
				}
			}
		} else {
			if (wildcards) {
				result = Wildcard.matchPathOne(uri, matches) != -1;
			} else {
				for (String match : matches) {
					if (uri.contains(match)) {
						result = true;
						break;
					}
				}
			}
		}

		if ((result) && (excludes != null)) {
			if (wildcards) {
				if (Wildcard.matchPathOne(uri, excludes) != -1) {
					result = false;
				}
			} else {
				for (String exclude : excludes) {
					if (uri.contains(exclude)) {
						result = false;						// excludes founded
						break;
					}
				}
			}
		}

		return result;
	}
Determine if request is eligible for GZipping.