org.springframework.web.reactive.function.client.WebClient.RequestHeadersSpec Java Exaples

Source File: PlaneService.java From Learning-Path-Spring-5-End-to-End-Programming with MIT License

6 votes

@HystrixCommand(commandKey = "plane-by-id",groupKey = "airline-flights",fallbackMethod = "fallback",commandProperties = {
    @HystrixProperty(name="circuitBreaker.requestVolumeThreshold",value="10"),
    @HystrixProperty(name = "circuitBreaker.errorThresholdPercentage", value = "10"),
    @HystrixProperty(name="circuitBreaker.sleepWindowInMilliseconds",value="10000"),
    @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "800"),
    @HystrixProperty(name = "metrics.rollingStats.timeInMilliseconds", value = "10000")
})
public Mono<Plane> plane(String id) {
  return discoveryService.serviceAddressFor(this.planesService).next()
          .flatMap(address -> Mono.just(this.webClient.mutate().baseUrl(address + "/" + id).build().get()))
          .flatMap(requestHeadersUriSpec ->
            Flux.combineLatest(Flux.just(requestHeadersUriSpec),Flux.from(tokenService.token()),(reqSpec, token) ->{
              reqSpec.header("Authorization","Bearer" + token.getToken());
            return reqSpec;
            })
           .next())
          .map(RequestHeadersSpec::retrieve)
          .flatMap(eq -> eq.bodyToMono(Plane.class));
}

Source File: FlightService.java From Spring-5.0-By-Example with MIT License

6 votes

@HystrixCommand(commandKey = "available-seats-query",groupKey = "airline-flights-query",commandProperties = {
    @HystrixProperty(name="circuitBreaker.requestVolumeThreshold",value="10"),
    @HystrixProperty(name = "circuitBreaker.errorThresholdPercentage", value = "10"),
    @HystrixProperty(name="circuitBreaker.sleepWindowInMilliseconds",value="10000"),
    @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "800"),
    @HystrixProperty(name = "metrics.rollingStats.timeInMilliseconds", value = "10000")
})
public Mono<AvailableSeats> availableSeats(@NonNull String flightId){
  return discoveryService.serviceAddressFor(this.flightsService).next()
      .flatMap(address -> Mono
          .just(this.webClient.mutate().baseUrl(address +"/" + flightId+ "/available").build().get()))
      .flatMap(requestHeadersUriSpec ->
          Flux.combineLatest(Flux.just(requestHeadersUriSpec),Flux.from(tokenService.token(this.flightsCredentials)),(reqSpec, token) ->{
            reqSpec.header("Authorization","Bearer" + token.getToken());
            return reqSpec;
          })
              .next())
      .map(RequestHeadersSpec::retrieve)
      .flatMap(res -> res.bodyToMono(AvailableSeats.class));
}

Source File: FlightService.java From Spring-5.0-By-Example with MIT License

6 votes

@HystrixCommand(commandKey = "flight-query",groupKey = "airline-flights-query",commandProperties = {
    @HystrixProperty(name="circuitBreaker.requestVolumeThreshold",value="10"),
    @HystrixProperty(name = "circuitBreaker.errorThresholdPercentage", value = "10"),
    @HystrixProperty(name="circuitBreaker.sleepWindowInMilliseconds",value="10000"),
    @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "800"),
    @HystrixProperty(name = "metrics.rollingStats.timeInMilliseconds", value = "10000")
})
public Flux<Flight> search(@NonNull FlightSearch query){
  return discoveryService.serviceAddressFor(this.flightsService).next()
      .flatMap(address -> Mono
          .just(this.webClient.mutate().baseUrl(address + "/query").build().post().body(
              BodyInserters.fromObject(query))))
      .flatMap(requestHeadersUriSpec ->
          Flux.combineLatest(Flux.just(requestHeadersUriSpec),Flux.from(tokenService.token(this.flightsCredentials)),(reqSpec, token) ->{
            reqSpec.header("Authorization","Bearer" + token.getToken());
            return reqSpec;
          })
              .next())
      .map(RequestHeadersSpec::retrieve)
      .flatMapMany(res -> res.bodyToFlux(Flight.class));
}

Source File: PassengerService.java From Spring-5.0-By-Example with MIT License

6 votes

@HystrixCommand(commandKey = "create-passenger",groupKey = "ecommerce-operations",commandProperties = {
    @HystrixProperty(name="circuitBreaker.requestVolumeThreshold",value="10"),
    @HystrixProperty(name = "circuitBreaker.errorThresholdPercentage", value = "10"),
    @HystrixProperty(name="circuitBreaker.sleepWindowInMilliseconds",value="10000"),
    @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "3000"),
    @HystrixProperty(name = "metrics.rollingStats.timeInMilliseconds", value = "10000")
})
public Mono<Passenger> newPassenger(@NonNull PassengerRequest passengerRequest){
  return discoveryService.serviceAddressFor(this.passengersService).next()
      .flatMap(address -> Mono
          .just(this.webClient.mutate().baseUrl(address).build().post().body(BodyInserters.fromObject(passengerRequest))))
      .flatMap(requestHeadersUriSpec ->
          Flux.combineLatest(Flux.just(requestHeadersUriSpec),Flux.from(tokenService.token(this.passengersCredentials)),(reqSpec, token) ->{
            reqSpec.header("Authorization","Bearer" + token.getToken());
            return reqSpec;
          })
              .next())
      .map(RequestHeadersSpec::retrieve)
      .flatMap(res -> res.bodyToMono(Passenger.class));
}

Source File: BookingService.java From Spring-5.0-By-Example with MIT License

6 votes

@HystrixCommand(commandKey = "buy-tickets",groupKey = "ecommerce-operations",commandProperties = {
    @HystrixProperty(name="circuitBreaker.requestVolumeThreshold",value="10"),
    @HystrixProperty(name = "circuitBreaker.errorThresholdPercentage", value = "10"),
    @HystrixProperty(name="circuitBreaker.sleepWindowInMilliseconds",value="10000"),
    @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "3000"),
    @HystrixProperty(name = "metrics.rollingStats.timeInMilliseconds", value = "10000")
})
public Mono<Passenger> buyTicket(@NonNull BookingRequest bookingRequest){
  return discoveryService.serviceAddressFor(this.bookingsService).next()
      .flatMap(address -> Mono
          .just(this.webClient.mutate().baseUrl(address).build().post().body(BodyInserters.fromObject(bookingRequest))))
      .flatMap(requestHeadersUriSpec ->
          Flux.combineLatest(Flux.just(requestHeadersUriSpec),Flux.from(tokenService.token(this.bookingsCredentials)),(reqSpec, token) ->{
            reqSpec.header("Authorization","Bearer" + token.getToken());
            return reqSpec;
          })
              .next())
      .map(RequestHeadersSpec::retrieve)
      .flatMap(res -> res.bodyToMono(Passenger.class));
}

Source File: FlightService.java From Spring-5.0-By-Example with MIT License

6 votes

@HystrixCommand(commandKey = "flight-by-id",groupKey = "airline-fare",commandProperties = {
    @HystrixProperty(name="circuitBreaker.requestVolumeThreshold",value="10"),
    @HystrixProperty(name = "circuitBreaker.errorThresholdPercentage", value = "10"),
    @HystrixProperty(name="circuitBreaker.sleepWindowInMilliseconds",value="10000"),
    @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "800"),
    @HystrixProperty(name = "metrics.rollingStats.timeInMilliseconds", value = "10000")
})
public Mono<Flight> flight(String id) {
  return discoveryService.serviceAddressFor(this.flightService).next()
      .flatMap(address -> Mono.just(this.webClient.mutate().baseUrl(address + "/" + id).build().get()))
      .flatMap(requestHeadersUriSpec ->
          Flux.combineLatest(Flux.just(requestHeadersUriSpec),Flux.from(tokenService.token(this.credentials)),(reqSpec, token) ->{
            reqSpec.header("Authorization","Bearer" + token.getToken());
            return reqSpec;
          })
       .next())
      .map(RequestHeadersSpec::retrieve)
      .doOnError(e -> {throw new RuntimeException("Invalid flight");})
      .flatMap(eq -> eq.bodyToMono(Flight.class));
}

Source File: BookingService.java From Spring-5.0-By-Example with MIT License

6 votes

@HystrixCommand(commandKey = "bookings-by-flight-id",groupKey = "airline-fare",commandProperties = {
    @HystrixProperty(name="circuitBreaker.requestVolumeThreshold",value="10"),
    @HystrixProperty(name = "circuitBreaker.errorThresholdPercentage", value = "10"),
    @HystrixProperty(name="circuitBreaker.sleepWindowInMilliseconds",value="10000"),
    @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "800"),
    @HystrixProperty(name = "metrics.rollingStats.timeInMilliseconds", value = "10000")
})
public Mono<Set<Booking>> bookingOfFlight(String flightId) {
  return discoveryService.serviceAddressFor(this.bookingService).next()
      .flatMap(address -> Mono.just(this.webClient.mutate().baseUrl(address + "/flight/" + flightId).build().get()))
      .flatMap(requestHeadersUriSpec ->
          Flux.combineLatest(Flux.just(requestHeadersUriSpec),Flux.from(tokenService.token(this.credentials)),(reqSpec, token) ->{
            reqSpec.header("Authorization","Bearer" + token.getToken());
            return reqSpec;
          })
              .next())
      .map(RequestHeadersSpec::retrieve)
      .flatMap(eq -> {
        ParameterizedTypeReference<Set<Booking>> typeRef = new ParameterizedTypeReference<Set<Booking>>() {};
        return eq.bodyToMono(typeRef);
      });
}

Source File: PlaneService.java From Spring-5.0-By-Example with MIT License

6 votes

@HystrixCommand(commandKey = "plane-by-id",groupKey = "airline-flights",fallbackMethod = "fallback",commandProperties = {
    @HystrixProperty(name="circuitBreaker.requestVolumeThreshold",value="10"),
    @HystrixProperty(name = "circuitBreaker.errorThresholdPercentage", value = "10"),
    @HystrixProperty(name="circuitBreaker.sleepWindowInMilliseconds",value="10000"),
    @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "800"),
    @HystrixProperty(name = "metrics.rollingStats.timeInMilliseconds", value = "10000")
})
public Mono<Plane> plane(String id) {
  return discoveryService.serviceAddressFor(this.planesService).next()
          .flatMap(address -> Mono.just(this.webClient.mutate().baseUrl(address + "/" + id).build().get()))
          .flatMap(requestHeadersUriSpec ->
            Flux.combineLatest(Flux.just(requestHeadersUriSpec),Flux.from(tokenService.token(this.credentials)),(reqSpec, token) ->{
              reqSpec.header("Authorization","Bearer" + token.getToken());
            return reqSpec;
            })
           .next())
          .map(RequestHeadersSpec::retrieve)
          .flatMap(eq -> eq.bodyToMono(Plane.class));
}

Source File: BookingService.java From Spring-5.0-By-Example with MIT License

6 votes

@HystrixCommand(commandKey = "available-seats", groupKey = "airline-flights", commandProperties = {
    @HystrixProperty(name = "circuitBreaker.requestVolumeThreshold", value = "10"),
    @HystrixProperty(name = "circuitBreaker.errorThresholdPercentage", value = "10"),
    @HystrixProperty(name = "circuitBreaker.sleepWindowInMilliseconds", value = "10000"),
    @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "800"),
    @HystrixProperty(name = "metrics.rollingStats.timeInMilliseconds", value = "10000")
})
public Mono<TotalBooked> totalBooked(String flightId) {
  return discoveryService.serviceAddressFor(this.bookingsService).next()
      .flatMap(address -> Mono.just(this.webClient.mutate().baseUrl(address + "/flights" + flightId).build().get()))
      .flatMap(requestHeadersUriSpec ->
          Flux.combineLatest(Flux.just(requestHeadersUriSpec),Flux.from(tokenService.token(this.credentials)),(reqSpec, token) ->{
            reqSpec.header("Authorization","Bearer" + token.getToken());
            return reqSpec;
          })
          .next())
      .map(RequestHeadersSpec::retrieve)
      .flatMap(eq -> eq.bodyToMono(TotalBooked.class));
}

Source File: PlaneService.java From Spring-5.0-By-Example with MIT License

6 votes

@HystrixCommand(commandKey = "plane-by-id", groupKey = "airline-booking", commandProperties = {
    @HystrixProperty(name = "circuitBreaker.requestVolumeThreshold", value = "10"),
    @HystrixProperty(name = "circuitBreaker.errorThresholdPercentage", value = "10"),
    @HystrixProperty(name = "circuitBreaker.sleepWindowInMilliseconds", value = "10000"),
    @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "800"),
    @HystrixProperty(name = "metrics.rollingStats.timeInMilliseconds", value = "10000")
})
public Mono<Plane> plane(String id) {
  return discoveryService.serviceAddressFor(this.planesService).next()
      .flatMap(address -> Mono.just(this.webClient.mutate().baseUrl(address + "/" + id).build().get()))
      .flatMap(requestHeadersUriSpec ->
          Flux.combineLatest(Flux.just(requestHeadersUriSpec),Flux.from(tokenService.token(this.credentials)),(reqSpec, token) ->{
            reqSpec.header("Authorization","Bearer" + token.getToken());
            return reqSpec;
          })
              .next())
      .map(RequestHeadersSpec::retrieve)
      .flatMap(eq -> eq.bodyToMono(Plane.class));
}

Source File: FlightService.java From Spring-5.0-By-Example with MIT License

6 votes

@HystrixCommand(commandKey = "flight-by-id",groupKey = "airline-fare",commandProperties = {
    @HystrixProperty(name="circuitBreaker.requestVolumeThreshold",value="10"),
    @HystrixProperty(name = "circuitBreaker.errorThresholdPercentage", value = "10"),
    @HystrixProperty(name="circuitBreaker.sleepWindowInMilliseconds",value="10000"),
    @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "800"),
    @HystrixProperty(name = "metrics.rollingStats.timeInMilliseconds", value = "10000")
})
public Mono<Flight> flight(String id) {
  return discoveryService.serviceAddressFor(this.flightService).next()
      .flatMap(address -> Mono.just(this.webClient.mutate().baseUrl(address + "/" + id).build().get()))
      .flatMap(requestHeadersUriSpec ->
          Flux.combineLatest(Flux.just(requestHeadersUriSpec),Flux.from(tokenService.token(this.credentials)),(reqSpec, token) ->{
            reqSpec.header("Authorization","Bearer" + token.getToken());
            return reqSpec;
          })
       .next())
      .map(RequestHeadersSpec::retrieve)
      .doOnError(e -> {throw new RuntimeException("Invalid flight");})
      .flatMap(eq -> eq.bodyToMono(Flight.class));
}

Source File: FareService.java From Spring-5.0-By-Example with MIT License

6 votes

@HystrixCommand(commandKey = "fare-by-id",groupKey = "airline-booking",commandProperties = {
    @HystrixProperty(name="circuitBreaker.requestVolumeThreshold",value="10"),
    @HystrixProperty(name = "circuitBreaker.errorThresholdPercentage", value = "10"),
    @HystrixProperty(name="circuitBreaker.sleepWindowInMilliseconds",value="10000"),
    @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "800"),
    @HystrixProperty(name = "metrics.rollingStats.timeInMilliseconds", value = "10000")
})
public Mono<Fare> fare(String id){
  return discoveryService.serviceAddressFor(this.fareService).next()
      .flatMap(address -> Mono.just(this.webClient.mutate().baseUrl(address + "/" + id).build().get()))
      .flatMap(requestHeadersUriSpec ->
          Flux.combineLatest(Flux.just(requestHeadersUriSpec),Flux.from(tokenService.token(this.credentials)),(reqSpec, token) ->{
            reqSpec.header("Authorization","Bearer" + token.getToken());
            return reqSpec;
          })
              .next())
      .map(RequestHeadersSpec::retrieve)
      .flatMap(eq -> eq.bodyToMono(Fare.class));
}

Source File: FlightService.java From Learning-Path-Spring-5-End-to-End-Programming with MIT License

6 votes

@HystrixCommand(commandKey = "available-seats-query",groupKey = "airline-flights-query",commandProperties = {
    @HystrixProperty(name="circuitBreaker.requestVolumeThreshold",value="10"),
    @HystrixProperty(name = "circuitBreaker.errorThresholdPercentage", value = "10"),
    @HystrixProperty(name="circuitBreaker.sleepWindowInMilliseconds",value="10000"),
    @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "800"),
    @HystrixProperty(name = "metrics.rollingStats.timeInMilliseconds", value = "10000")
})
public Mono<AvailableSeats> availableSeats(@NonNull String flightId){
  return discoveryService.serviceAddressFor(this.flightsService).next()
      .flatMap(address -> Mono
          .just(this.webClient.mutate().baseUrl(address +"/" + flightId+ "/available").build().get()))
      .flatMap(requestHeadersUriSpec ->
          Flux.combineLatest(Flux.just(requestHeadersUriSpec),Flux.from(tokenService.token(this.flightsCredentials)),(reqSpec, token) ->{
            reqSpec.header("Authorization","Bearer" + token.getToken());
            return reqSpec;
          })
              .next())
      .map(RequestHeadersSpec::retrieve)
      .flatMap(res -> res.bodyToMono(AvailableSeats.class));
}

Source File: FlightService.java From Learning-Path-Spring-5-End-to-End-Programming with MIT License

6 votes

@HystrixCommand(commandKey = "flight-query",groupKey = "airline-flights-query",commandProperties = {
    @HystrixProperty(name="circuitBreaker.requestVolumeThreshold",value="10"),
    @HystrixProperty(name = "circuitBreaker.errorThresholdPercentage", value = "10"),
    @HystrixProperty(name="circuitBreaker.sleepWindowInMilliseconds",value="10000"),
    @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "800"),
    @HystrixProperty(name = "metrics.rollingStats.timeInMilliseconds", value = "10000")
})
public Flux<Flight> search(@NonNull FlightSearch query){
  return discoveryService.serviceAddressFor(this.flightsService).next()
      .flatMap(address -> Mono
          .just(this.webClient.mutate().baseUrl(address + "/query").build().post().body(
              BodyInserters.fromObject(query))))
      .flatMap(requestHeadersUriSpec ->
          Flux.combineLatest(Flux.just(requestHeadersUriSpec),Flux.from(tokenService.token(this.flightsCredentials)),(reqSpec, token) ->{
            reqSpec.header("Authorization","Bearer" + token.getToken());
            return reqSpec;
          })
              .next())
      .map(RequestHeadersSpec::retrieve)
      .flatMapMany(res -> res.bodyToFlux(Flight.class));
}

Source File: BookingService.java From Learning-Path-Spring-5-End-to-End-Programming with MIT License

6 votes

@HystrixCommand(commandKey = "bookings-total",groupKey = "airline-bookings-total",commandProperties = {
    @HystrixProperty(name="circuitBreaker.requestVolumeThreshold",value="10"),
    @HystrixProperty(name = "circuitBreaker.errorThresholdPercentage", value = "10"),
    @HystrixProperty(name="circuitBreaker.sleepWindowInMilliseconds",value="10000"),
    @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "800"),
    @HystrixProperty(name = "metrics.rollingStats.timeInMilliseconds", value = "10000")
})
public Mono<TotalBooked> totalBooked(@NonNull String flightId){
  return discoveryService.serviceAddressFor(this.bookingsService).next()
      .flatMap(address -> Mono
          .just(this.webClient.mutate().baseUrl(address + "/" + flightId +"/total").build().get()))
      .flatMap(requestHeadersUriSpec ->
          Flux.combineLatest(Flux.just(requestHeadersUriSpec),Flux.from(tokenService.token(this.bookingsCredentials)),(reqSpec, token) ->{
            reqSpec.header("Authorization","Bearer" + token.getToken());
            return reqSpec;
          })
              .next())
      .map(RequestHeadersSpec::retrieve)
      .flatMap(res -> res.bodyToMono(TotalBooked.class));
}

Source File: BookingService.java From Learning-Path-Spring-5-End-to-End-Programming with MIT License

6 votes

@HystrixCommand(commandKey = "available-seats", groupKey = "airline-flights", commandProperties = {
    @HystrixProperty(name = "circuitBreaker.requestVolumeThreshold", value = "10"),
    @HystrixProperty(name = "circuitBreaker.errorThresholdPercentage", value = "10"),
    @HystrixProperty(name = "circuitBreaker.sleepWindowInMilliseconds", value = "10000"),
    @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "800"),
    @HystrixProperty(name = "metrics.rollingStats.timeInMilliseconds", value = "10000")
})
public Mono<TotalBooked> totalBooked(String flightId) {
  return discoveryService.serviceAddressFor(this.bookingsService).next()
      .flatMap(address -> Mono.just(this.webClient.mutate().baseUrl(address + "/flights" + flightId).build().get()))
      .flatMap(requestHeadersUriSpec ->
          Flux.combineLatest(Flux.just(requestHeadersUriSpec),Flux.from(tokenService.token()),(reqSpec, token) ->{
            reqSpec.header("Authorization","Bearer" + token.getToken());
            return reqSpec;
          })
          .next())
      .map(RequestHeadersSpec::retrieve)
      .flatMap(eq -> eq.bodyToMono(TotalBooked.class));
}

Source File: ApiProxyController.java From demo-spring-webflux-api-gateway with Apache License 2.0

4 votes

/**
    * 
    * @param exchange 
    * @return
    */
   @RequestMapping("/**")
   public Mono<Void>  proxyRequest(ServerWebExchange exchange)
{
	ServerHttpRequest frontEndReq = exchange.getRequest();
	ServerHttpResponse frontEndResp = exchange.getResponse();
	String path = frontEndReq.getPath().pathWithinApplication().value();
	HttpMethod httpMethod = frontEndReq.getMethod();
	RequestBodySpec reqBodySpec = webClient.method(httpMethod).
			uri(backendServiceUrlPrefix.concat(path)).
			headers(httpHeaders -> 
			        {
	                  httpHeaders.addAll(frontEndReq.getHeaders());
	                  httpHeaders.remove("HOST");
	                });
	
	RequestHeadersSpec<?> reqHeadersSpec;
    if (requireHttpBody(httpMethod)) {
    		  reqHeadersSpec = reqBodySpec.body(BodyInserters.fromDataBuffers(frontEndReq.getBody()));
    } else {
    	      reqHeadersSpec = reqBodySpec;
    	}
    
	//调用后端服务
	return reqHeadersSpec.exchange().timeout(Duration.ofMillis(backendServiceTimeoutInMillis)).
			onErrorResume(ex -> 
		    { 
			    //调用后端服务异常(超时、网络问题)时，转发到后端异常-后控制器
		    	    //此处也可不用转发，用frontEndResp.writeWith(...)直接将异常响应写回给调用方
		    	    Map<String,Object> forwardAttrs = new HashMap<>();
		    	    forwardAttrs.put(Constant.BACKEND_EXCEPTION_ATTR_NAME,ex);
                return WebfluxForwardingUtil.forward(Constant.BACKEND_EXCEPTION_PATH,exchange,forwardAttrs)
                		.then(Mono.empty());
			}).flatMap(backendResponse -> 
		    {
		    	    //将后端服务的响应回写到前端resp
		    	    frontEndResp.setStatusCode(backendResponse.statusCode());
		    	    frontEndResp.getHeaders().putAll(backendResponse.headers().asHttpHeaders());
		    	    return frontEndResp.writeWith(backendResponse.bodyToFlux(DataBuffer.class));
		    	}
		    	);
}

Source File: WebClientHttpRoutingFilter.java From spring-cloud-gateway with Apache License 2.0

4 votes

@Override
public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
	URI requestUrl = exchange.getRequiredAttribute(GATEWAY_REQUEST_URL_ATTR);

	String scheme = requestUrl.getScheme();
	if (isAlreadyRouted(exchange)
			|| (!"http".equals(scheme) && !"https".equals(scheme))) {
		return chain.filter(exchange);
	}
	setAlreadyRouted(exchange);

	ServerHttpRequest request = exchange.getRequest();

	HttpMethod method = request.getMethod();

	HttpHeaders filteredHeaders = filterRequest(getHeadersFilters(), exchange);

	boolean preserveHost = exchange
			.getAttributeOrDefault(PRESERVE_HOST_HEADER_ATTRIBUTE, false);

	RequestBodySpec bodySpec = this.webClient.method(method).uri(requestUrl)
			.headers(httpHeaders -> {
				httpHeaders.addAll(filteredHeaders);
				// TODO: can this support preserviceHostHeader?
				if (!preserveHost) {
					httpHeaders.remove(HttpHeaders.HOST);
				}
			});

	RequestHeadersSpec<?> headersSpec;
	if (requiresBody(method)) {
		headersSpec = bodySpec.body(BodyInserters.fromDataBuffers(request.getBody()));
	}
	else {
		headersSpec = bodySpec;
	}

	return headersSpec.exchange()
			// .log("webClient route")
			.flatMap(res -> {
				ServerHttpResponse response = exchange.getResponse();
				response.getHeaders().putAll(res.headers().asHttpHeaders());
				response.setStatusCode(res.statusCode());
				// Defer committing the response until all route filters have run
				// Put client response as ServerWebExchange attribute and write
				// response later NettyWriteResponseFilter
				exchange.getAttributes().put(CLIENT_RESPONSE_ATTR, res);
				return chain.filter(exchange);
			});
}

org.springframework.web.reactive.function.client.WebClient.RequestHeadersSpec Java Examples