Validate contextPath in RedirectView [SPR-16752]

[spring-projects-issues]

Rossen Stoyanchev opened SPR-16752 and commented

Normalization is not explicitly discussed in the Servlet spec, so we need to check and validate that when prepending the contextPath for context-relative redirects.

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Affects: 4.3.16

Backported to: 4.3.17