Initialize RequestPath on demand

Closes gh-33227

Author: rstoyanchev

spring-web/src/main/java/org/springframework/http/server/reactive/AbstractServerHttpRequest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -50,7 +50,11 @@ public abstract class AbstractServerHttpRequest implements ServerHttpRequest {
 
 	private final URI uri;
 
-	private final RequestPath path;
+	@Nullable
+	private final String contextPath;
+
+	@Nullable
+	private RequestPath path;
 
 	private final HttpHeaders headers;
 
@@ -92,7 +96,7 @@ public AbstractServerHttpRequest(HttpMethod method, URI uri, @Nullable String co
 
 		this.method = method;
 		this.uri = uri;
-		this.path = RequestPath.parse(uri, contextPath);
+		this.contextPath = contextPath;
 		this.headers = HttpHeaders.readOnlyHttpHeaders(headers);
 	}
 
@@ -140,6 +144,9 @@ public Map<String, Object> getAttributes() {
 
 	@Override
 	public RequestPath getPath() {
+		if (this.path == null) {
+			this.path = RequestPath.parse(this.uri, this.contextPath);
+		}
 		return this.path;
 	}
 

spring-web/src/test/java/org/springframework/http/server/reactive/ServerHttpRequestTests.java

@@ -198,7 +198,7 @@ void mutateWithExistingContextPath() throws Exception {
 	void mutateContextPathWithoutUpdatingPathShouldFail() throws Exception {
 		ServerHttpRequest request = createRequest("/context/path", "/context");
 
-		assertThatThrownBy(() -> request.mutate().contextPath("/fail").build())
+		assertThatThrownBy(() -> request.mutate().contextPath("/fail").build().getPath())
 				.isInstanceOf(IllegalArgumentException.class)
 				.hasMessage("Invalid contextPath '/fail': must match the start of requestPath: '/context/path'");
 	}