Multiple slash sanitisation should be optional in UriComponentsBuilder

[dpozinen]

The primary reason for this issue is spring-cloud/spring-cloud-gateway#2795 which under the hood uses UriComponentsBuilder. See this comment specifically: spring-cloud/spring-cloud-gateway#2795 (comment)

In the context of #14904 and #17006 there have been changes made to sanitise multiple consecutive slashes and replace them via a single slash:

spring-framework/spring-web/src/main/java/org/springframework/web/util/UriComponentsBuilder.java

Lines 881 to 891 in 78f28fd

	private static String getSanitizedPath(final StringBuilder path) {
	int index = path.indexOf("//");
	if (index >= 0) {
	StringBuilder sanitized = new StringBuilder(path);
	while (index != -1) {
	sanitized.deleteCharAt(index);
	index = sanitized.indexOf("//", index);
	}
	return sanitized.toString();
	}
	return path.toString();

Technically, there is no restriction on multiple consecutive slashes - those are valid urls, so I think that adding the option of preserving those in UriComponentsBuilder would be a good thing, and would solve the mentioned gateway issue.

What do you think?