Spring Rest Template Injects Value into Parameter with %

Can someone please explain to me what is happening in the following code?

If I run:

RestTemplate rest = new RestTemplate();
HttpHeaders headers = new HttpHeaders();
headers.add("header1", "data");
headers.add("header2", "data");
HttpEntity<String> entity = new HttpEntity<>("body", headers);

ResponseEntity<JSONObject> response = 
rest.exchange("https://example.com/../{username}/{path}", HttpMethod.GET, entity, JSONObject.class, "user%123", "path");

JavaScript
​x
 
RestTemplate rest = new RestTemplate();HttpHeaders headers = new HttpHeaders();headers.add("header1", "data");headers.add("header2", "data");HttpEntity<String> entity = new HttpEntity<>("body", headers);​ResponseEntity<JSONObject> response = rest.exchange("https://example.com/../{username}/{path}", HttpMethod.GET, entity, JSONObject.class, "user%123", "path");​

Spring tells me that the URL used is https://example.com/../username/path where username = user%25123 even though I set the username = user%123.

This is looking to me to be not a Spring issue, rather a URL encoding issue, but can anyone tell me where this extra 25 comes from?

Answer

%25 is a URL-encoded percent sign, so user%123 encodes to user%25123

More info: https://www.w3schools.com/tags/ref_urlencode.ASP

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Answer