众所周知，springCloud gateway用的是异步请求方式，即webflux。

当拦截请求时，如url包含大括号“{}”特殊字符时，会报Failed to get request URI: xxx 异常。

此时需要正确请求访问，需要重写源码中相应方法：

package org.springframework.http.server.reactive;

import io.netty.channel.ChannelPipeline;
import io.netty.handler.codec.http.HttpHeaderNames;
import io.netty.handler.codec.http.cookie.Cookie;
import io.netty.handler.ssl.SslHandler;
import java.net.InetSocketAddress;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Iterator;
import java.util.Set;
import javax.net.ssl.SSLSession;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.NettyDataBufferFactory;
import org.springframework.http.HttpCookie;
import org.springframework.http.HttpHeaders;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import reactor.core.publisher.Flux;
import reactor.ipc.netty.ByteBufFlux;
import reactor.ipc.netty.http.server.HttpServerRequest;

/**
 * 重写initUri(HttpServerRequest request)方法，处理请求参数中{}被网关拦截的问题
 */
class ReactorServerHttpRequest extends AbstractServerHttpRequest {
    private final HttpServerRequest request;
    private final NettyDataBufferFactory bufferFactory;

    public ReactorServerHttpRequest(HttpServerRequest request, NettyDataBufferFactory bufferFactory) throws URISyntaxException {
        super(initUri(request), "", initHeaders(request));
        Assert.notNull(bufferFactory, "DataBufferFactory must not be null");
        this.request = request;
        this.bufferFactory = bufferFactory;
    }

    private static URI initUri(HttpServerRequest request) throws URISyntaxException {
        Assert.notNull(request, "HttpServerRequest must not be null");
        return new URI(resolveBaseUrl(request).toString() + resolveRequestUri(request));
    }

 

    private static URI resolveBaseUrl(HttpServerRequest request) throws URISyntaxException {
        String scheme = getScheme(request);
        String header = request.requestHeaders().get(HttpHeaderNames.HOST);
        if (header != null) {
            int portIndex;
            if (header.startsWith("[")) {
                portIndex = header.indexOf(58, header.indexOf(93));
            } else {
                portIndex = header.indexOf(58);
            }

            if (portIndex != -1) {
                try {
                    return new URI(scheme, (String)null, header.substring(0, portIndex), Integer.parseInt(header.substring(portIndex + 1)), (String)null, (String)null, (String)null);
                } catch (NumberFormatException var5) {
                    throw new URISyntaxException(header, "Unable to parse port", portIndex);
                }
            } else {
                return new URI(scheme, header, (String)null, (String)null);
            }
        } else {
            InetSocketAddress localAddress = (InetSocketAddress)request.context().channel().localAddress();
            return new URI(scheme, (String)null, localAddress.getHostString(), localAddress.getPort(), (String)null, (String)null, (String)null);
        }
    }

    private static String getScheme(HttpServerRequest request) {
        ChannelPipeline pipeline = request.context().channel().pipeline();
        boolean ssl = pipeline.get(SslHandler.class) != null;
        return ssl ? "https" : "http";
    }

    private static String resolveRequestUri(HttpServerRequest request) {
        String uri = request.uri();

        for(int i = 0; i < uri.length(); ++i) {
            char c = uri.charAt(i);
            if (c == '/' || c == '?' || c == '#') {
                break;
            }

            if (c == ':' && i + 2 < uri.length() && uri.charAt(i + 1) == '/' && uri.charAt(i + 2) == '/') {
                for(int j = i + 3; j < uri.length(); ++j) {
                    c = uri.charAt(j);
                    if (c == '/' || c == '?' || c == '#') {
                        return uri.substring(j);
                    }
                }

                return "";
            }
        }

        return uri;
    }

    private static HttpHeaders initHeaders(HttpServerRequest channel) {
        HttpHeaders headers = new HttpHeaders();
        Iterator var2 = channel.requestHeaders().names().iterator();

        while(var2.hasNext()) {
            String name = (String)var2.next();
            headers.put(name, channel.requestHeaders().getAll(name));
        }

        return headers;
    }

    public String getMethodValue() {
        return this.request.method().name();
    }

    protected MultiValueMap<String, HttpCookie> initCookies() {
        MultiValueMap<String, HttpCookie> cookies = new LinkedMultiValueMap();
        Iterator var2 = this.request.cookies().keySet().iterator();

        while(var2.hasNext()) {
            CharSequence name = (CharSequence)var2.next();
            Iterator var4 = ((Set)this.request.cookies().get(name)).iterator();

            while(var4.hasNext()) {
                Cookie cookie = (Cookie)var4.next();
                HttpCookie httpCookie = new HttpCookie(name.toString(), cookie.value());
                cookies.add(name.toString(), httpCookie);
            }
        }

        return cookies;
    }

    public InetSocketAddress getRemoteAddress() {
        return this.request.remoteAddress();
    }

    @Nullable
    protected SslInfo initSslInfo() {
        SslHandler sslHandler = (SslHandler)this.request.context().channel().pipeline().get(SslHandler.class);
        if (sslHandler != null) {
            SSLSession session = sslHandler.engine().getSession();
            return new DefaultSslInfo(session);
        } else {
            return null;
        }
    }

    public Flux<DataBuffer> getBody() {
        ByteBufFlux var10000 = this.request.receive().retain();
        NettyDataBufferFactory var10001 = this.bufferFactory;
        var10001.getClass();
        return var10000.map(var10001::wrap);
    }

    public <T> T getNativeRequest() {
        return (T) this.request;
    }
}

通过修改该类中的initUri方法实现“{}”特殊字符通过网关，不被拦截。

具体替换为：

private static URI initUri(HttpServerRequest request) throws URISyntaxException {
        Assert.notNull(request, "HttpServerRequest must not be null");
        // 针对 特殊字符 { } 做替换处理
        String requestUri = resolveRequestUri(request).replace("{", "%7B").replace("}", "%7D");
        return new URI(resolveBaseUrl(request).toString() + requestUri);
    }

经测试，能正常访问。

ps：目前springBoot版本为：2.X。