Allow LocalHostUriTemplateHandler to be created with a custom underlying UriTemplateHandler

[mihhail-lapushkin]

• In TestRestTemplateContextCustomizer a LocalHostUriTemplateHandler gets created and passed to TestRestTemplate.
• LocalHostUriTemplateHandler creates DefaultUriBuilderFactory in the constructor and does not provide any means to modify/replace it later.
• I would like to have a way to replace DefaultUriBuilderFactory (RootUriTemplateHandler.handler) with my custom implementation.

[wilkinsona]

Can you please describe what you'd like to be able to do in more detail? You've describe the how (of one approach) but I don't really understand what, exactly, you want to do and why you want to do it. It's important to understand it as there may be another way to achieve the same goal.

[mihhail-lapushkin]

My issue is that SB2 (or rather Spring 5) removed + encoding in TestRestTemplate:
spring-projects/spring-framework@f2e293a#diff-774d5dc1a5c7494860b8f715e5976d04

I need to use + in URLs in my tests. Full URLs as a string, not as a template. There are 2 way I can make it happen:

1. Provide my own implementation of RootUriTemplateHandler.handler that just encodes plusses in the URI that expand returns. My current approach.
2. Obtain a reference to RootUriTemplateHandler.handler and modify the EncodingMode to VALUES_ONLY. This would force me to pre-encode the URL myself (as I understood from testing), but I don't want to do it, as I would have to duplicate a lot of code that already exists in RestTemplate.

If there is an easy third way to bring back + encoding, I would love to hear it.

[wilkinsona]

Thanks.

How about an overloaded constructor on LocalHostUriTemplateHandler that takes a UriTemplateHandler:

	public LocalHostUriTemplateHandler(Environment environment, String scheme,
			UriTemplateHandler uriTemplateHandler) {
		super(uriTemplateHandler);
		Assert.notNull(environment, "Environment must not be null");
		Assert.notNull(scheme, "Scheme must not be null");
		this.environment = environment;
		this.scheme = scheme;
	}

You could then create your own TestRestTemplate configured to use your customised LocalHostUriTemplateHandler.

[mihhail-lapushkin]

This would work for me.