undertow eat 400 error

[xingzheone]

when http://localhost:3000/some?jn={zhege:12,name:%22feng%22}
private static final String BAD_REQUEST = "HTTP/1.1 400 Bad Request\r\nContent-Length: 0\r\nConnection: close\r\n\r\n";

static {
        try {
            HTTP = "HTTP/1.".getBytes("ASCII");
            HTTP_LENGTH = HTTP.length;
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException(e);
        }
        for(int i = 0; i < 256; ++i) {
            if(i < 32 || i > 126) {
                ALLOWED_TARGET_CHARACTER[i] = false;
            } else {
                switch ((char)i) {
                    case '\"':
                    case '#':
                    case '<':
                    case '>':
                    case '\\':
                    case '^':
                    case '`':
                    case '{':
                    case '|':
                    case '}':
                        ALLOWED_TARGET_CHARACTER[i] = false;
                        break;
                    default:
                        ALLOWED_TARGET_CHARACTER[i] = true;
                }
            }
        }
    }

  public static boolean isTargetCharacterAllowed(char c) {
        return ALLOWED_TARGET_CHARACTER[c];
    }

public static final Option<Boolean> ALLOW_UNESCAPED_CHARACTERS_IN_URL = Option.simple(UndertowOptions.class,"ALLOW_UNESCAPED_CHARACTERS_IN_URL", Boolean.class);

HttpRequestParser.java
if(!allowUnescapedCharactersInUrl && !ALLOWED_TARGET_CHARACTER[next]) {
throw new BadRequestException(UndertowMessages.MESSAGES.invalidCharacterInRequestTarget(next));
}

[yogthos]

linking the issue here luminus-framework/ring-undertow-adapter#20

this may need to be fixed upstream in undertow