Webflux Webclient escape slash in URL

Question

I need to include a slash in an URL to access RabbitMQ API and I'm trying to fetch data using WebClient:

WebClient.builder()
     .baseUrl("https://RABBIT_HOSTNAME/api/queues/%2F/QUEUE_NAME")
     .build()
     .get().exchange();

When I replace / with %2F I can see in the request descriptor that %2F has been changed to %252F and because of it I'm getting not found response.

I've tried the following options:

• "\\/" - WebClient changes to %5C but Rabbit doesn't interpret it correctly and returns 404.

• "%5C" - WebClient changes to %255C, Rabbit returns 404.

How can I persist %2F in an url using WebClient?

123 · Accepted Answer · 2020-04-18T09:47:28.660

By default it will always encode the URL, so I can see two options

Completely ignore the baseUrl method and pass a fully qualified URL into the uri method which will override the baseUrl method.

WebClient.builder()
     .build()
     .uri(URI.create( "https://RABBIT_HOSTNAME/api/queues/%2F/QUEUE_NAME"))
     .get().exchange();

Create your own custom UriBuilderFactory, map a Uri, and set the encoding to NONE

public class CustomUriBuilderFactory extends DefaultUriBuilderFactory {

    public CustomUriBuilderFactory(String baseUriTemplate) {
        super(UriComponentsBuilder.fromHttpUrl(baseUriTemplate));
        super.setEncodingMode(EncodingMode.NONE);
    }
}

and then you can use uriBuilderFactory of baseUrl, which will allow you to still use uri for just the uri part

WebClient.builder()
        .uriBuilderFactory(
            new CustomUriBuilderFactory(
                "https://RABBIT_HOSTNAME/api/queues/%2F/QUEUE_NAME"
        ))
        .build()
        .get()
        .uri(whatever)
        .exchange();

V. Mokrecov · Answer 2 · 2020-04-17T20:50:36.307

2

You can implement this:

URI uri = URI.create("%2F");

And:

WebClient.builder()
        .baseUrl("https://RABBIT_HOSTNAME/api/queues")
        .build()
        .post()
        .uri(uriBuilder -> uriBuilder.pathSegment(uri.getPath(), "QUEUE_NAME").build())...

edited Apr 17 '20 at 20:50

answered Apr 17 '20 at 13:13

V. Mokrecov

1,014
1
11
20

I corrected the answer, maybe this solution will work for you? – V. Mokrecov Apr 17 '20 at 20:51

score 0 · Answer 3 · answered Dec 15 '22 at 08:08

If you use the uriBuilder and specify a path with a placeholder that is completed via the build method then the argument in the build method is automatically encoded correctly:

client.get()
      .uri(uriBuilder -> uriBuilder.path("/foo/{fooValue}")
                                   .build(valueWithSpecialCharacter))
      .retrieve()
      .bodyToMono(Foo.class);

Webflux Webclient escape slash in URL

3 Answers3