Keep encoded plus signs in query parameters intact

[dvag-yannick-reifschneider]

This change keeps encoded + sign intact in query parameters. Otherwise the plus sign gets decoded and is then interpreted as space character.

[gatewaynovice]

I ran into the same issue, I hope this can be merged soon and available in the next release.

[gatewaynovice]

Why is this check being removed? Can we assume URI is always encoded?

[dvag-yannick-reifschneider]

I am not sure why this check was added in the first place. In my opinion, spring-cloud-gateway should not encode or decode parameters or URI parts, but leave them untouched. A similar change is also proposed in https://github.com/spring-cloud/spring-cloud-gateway/pull/3437/files

[gatewaynovice]

I think the intent may be if the incoming URI is already encoded, keep the encoding...otherwise don't. Not working that way though, I'm seeing the request is decoded by the time it reaches the backend.

The key is handling replaceQueryParms piece below, may be we need to encode the request parms if the request is already encoded ?

something like

    boolean encoded = containsEncodedQuery(serverRequest.uri(), serverRequest.params());
    var parms = serverRequest.params();;
    if(encoded) {
        //pseudo code
        parms = encode(serverRequest.params());
    }
URI url = UriComponentsBuilder.fromUri(serverRequest.uri())
			.scheme(uri.getScheme())
			.host(uri.getHost())
			.port(uri.getPort())
			.replaceQueryParams(parms))
			.build(encoded)
			.toUri();

[dmyronenko]

if you add/change some query params in pre filters they will not be added to request I guess

[dvag-yannick-reifschneider]

Good catch, I assumed query params were already included in serverRequest.uri(). I think this needs an additional integration test.

[sfilipiak-inpost]

I've been trying to fix this issue in our project aswell, and what I find to be working best is this

URI url = UriComponentsBuilder.fromUri(serverRequest.uri())
            .scheme(uri.getScheme())
            .host(uri.getHost())
            .port(uri.getPort())
            .replaceQueryParams(serverRequest.params())
            .encode()
            .build()
            .toUri();

It solves all cases we have found so far.

[gatewaynovice]

This issue is closely related to #2065 which has been open for a while now.