springboot服务url包含{}大括号特殊字符的问题

springboot服务url包含{}大括号特殊字符的问题

问题描述：
三方系统调用我方提供的接口（spring boot服务提供接口）时，当url中包含未经过urlencode的特殊字符大括号“{}”，则会报400，导致请求都无法正常处理。

针对使用tomcat容器的服务

增加如下配置即可解决url不支持大括号{}的问题

import org.springframework.boot.context.embedded.EmbeddedServletContainerFactory;
import org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * 配置Spring boot支持在查询参数中加{}[]字符。
  *
 * @author jacky
 * @since 2019/09/05
 */
@Configuration
public class SystemConfig {

    @Bean
  public EmbeddedServletContainerFactory webServerFactory() {
        TomcatEmbeddedServletContainerFactory factory = new TomcatEmbeddedServletContainerFactory();
  factory.addConnectorCustomizers((connector) ->
            connector.setProperty("relaxedQueryChars", "[]{}")
        );

 return factory;
  }
}

针对使用webflux的springboot2.x服务

通过查看源码如下，当url包含大括号“{}”特殊字符时，会报Failed to get request URI: xxx 异常

/*
 * Copyright 2002-2018 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.http.server.reactive;

import java.net.URISyntaxException;
import java.util.function.BiFunction;

import io.netty.handler.codec.http.HttpResponseStatus;
import org.apache.commons.logging.Log;
import reactor.core.publisher.Mono;
import reactor.netty.http.server.HttpServerRequest;
import reactor.netty.http.server.HttpServerResponse;

import org.springframework.core.io.buffer.NettyDataBufferFactory;
import org.springframework.http.HttpLogging;
import org.springframework.http.HttpMethod;
import org.springframework.util.Assert;

/**
 * Adapt {@link HttpHandler} to the Reactor Netty channel handling function.
 *
 * @author Stephane Maldini
 * @author Rossen Stoyanchev
 * @since 5.0
 */
public class ReactorHttpHandlerAdapter implements BiFunction<HttpServerRequest, HttpServerResponse, Mono<Void>> {

	private static final Log logger = HttpLogging.forLogName(ReactorHttpHandlerAdapter.class);


	private final HttpHandler httpHandler;


	public ReactorHttpHandlerAdapter(HttpHandler httpHandler) {
		Assert.notNull(httpHandler, "HttpHandler must not be null");
		this.httpHandler = httpHandler;
	}


	@Override
	public Mono<Void> apply(HttpServerRequest reactorRequest, HttpServerResponse reactorResponse) {
		NettyDataBufferFactory bufferFactory = new NettyDataBufferFactory(reactorResponse.alloc());
		try {
			ReactorServerHttpRequest request = new ReactorServerHttpRequest(reactorRequest, bufferFactory);
			ServerHttpResponse response = new ReactorServerHttpResponse(reactorResponse, bufferFactory);

			if (request.getMethod() == HttpMethod.HEAD) {
				response = new HttpHeadResponseDecorator(response);
			}

			return this.httpHandler.handle(request, response)
					.doOnError(ex -> logger.trace(request.getLogPrefix() + "Failed to complete: " + ex.getMessage()))
					.doOnSuccess(aVoid -> logger.trace(request.getLogPrefix() + "Handling completed"));
		}
		catch (URISyntaxException ex) {
			if (logger.isDebugEnabled()) {
				logger.debug("Failed to get request URI: " + ex.getMessage());
			}
			reactorResponse.status(HttpResponseStatus.BAD_REQUEST);
			return Mono.empty();
		}
	}

}

暂时没找到通过配置可以解决的方案，只能修改覆盖这个类的源码以达到支持的目的。
修改覆盖源码的方式如下：
org.springframework.http.server.reactive.ReactorServerHttpRequest

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);
}