Springboot : Prevent double encoding of % by Resttemplate

Question

Our code uses Asyncresttemplate as follows

String uri = http://api.host.com/version/test?address=%23&language=en-US&format=json

getAysncRestTemplate().getForEntity(uri, String.class);

But %23 is double encoded in Rest template as %2523 and the url becomes http://api.host.com/version/test?address=%2523&language=en-US&format=json, But I need to pass encoded string, It doesn't encode if I pass decoded data '#'

How can I send this request without double encoding the URL?

Already tried using UriComponentsBuilder Avoid Double Encoding of URL query param with Spring's RestTemplate

Answer 1

The uri argument (of type String) passed to the RestTemplate is actually a URI template as per the JavaDoc. The way to use the rest template without the double encoding would be as follows:

getAysncRestTemplate().getForEntity(
        "http://api.host.com/version/test?address={address}&language=en-US&format=json", 
        String.class, 
        "#"); // (%23 decoded)

If you know you already have a properly encoded URL you can use the method that has a URI as the first parameter instead:

restTemplate.getForEntity(
        new URI("http://api.host.com/version/test?address=%23&language=en-US&format=json"),
        String.class);

Answer 2

You can avoid this by not encoding any part of it yourself, e.g use # rather than %23