我想使用springwebflux发出post请求。我试过这个：
web客户端版本：

public RestClient(String gatewayUrl, String token, String username, String password, SslContext sslContext) {
        this.token = token;
        this.gatewayUrl = gatewayUrl;
        WebClient.Builder builder = WebClient.builder().baseUrl(gatewayUrl);
        if (sslContext != null) {
            HttpClient httpClient = HttpClient.create().secure(sslContextSpec -> sslContextSpec.sslContext(sslContext));
            ClientHttpConnector httpConnector = new ReactorClientHttpConnector(httpClient);
            builder.clientConnector(httpConnector);
        }
        if (username != null && password != null) {
            builder.filter(basicAuthentication(username, password));
        }
        client = builder.build();
    }

......

public class RestClientBuilder {
    private String token;
    private String username;
    private String password;
    private URL gatewayUrl;
    private SslContextBuilder sslContextBuilder;

    public static RestClientBuilder builder() {
        return new RestClientBuilder();
    }

    public RestClientBuilder token(String token) {
        this.token = validateAndTrim(token, "Token");
        return this;
    }

    public RestClientBuilder usernamePassword(String username, String password) {
        this.username = validateAndTrim(username, "Username");
        this.password = validateAndTrim(password, "Password");
        return this;
    }

    private String validateAndTrim(String value, final String parameter) {
        if (value == null || value.trim().isEmpty()) {
            throw new IllegalArgumentException(parameter + " is empty");
        }
        return value.trim();
    }

    public RestClientBuilder gatewayUrl(String gatewayUrl) {
        String urlSt = validateAndTrim(gatewayUrl, "Gateway URL");
        try {
            this.gatewayUrl = new URL(urlSt);
        } catch (MalformedURLException e) {
            throw new IllegalArgumentException("Malformed URL: " + urlSt, e);
        }
        return this;
    }

    public RestClientBuilder truststore(File truststoreFile) {
        getSslContextBuilder().trustManager(truststoreFile);
        return this;
    }

    public RestClientBuilder sslCertificate(File keyCertChainFile, File keyFile, String keyPassword) {
        getSslContextBuilder().keyManager(keyCertChainFile, keyFile, keyPassword);
        return this;
    }

    public RestClient build() throws SSLException {
        SslContext sslContext = sslContextBuilder != null ? sslContextBuilder.build() : null;
        return new RestClient(gatewayUrl.toString(), token, username, password, sslContext);
    }

    private SslContextBuilder getSslContextBuilder() {
        if (sslContextBuilder == null) {
            sslContextBuilder = SslContextBuilder.forClient();
        }
        return sslContextBuilder;
    }

}

测试成功：

client.post()
            .uri("https://test.oppwa.com/v1/checkouts?entityId=1234567&amount=92.00&currency=GBP&paymentType=DB")
            .header(HttpHeaders.USER_AGENT, "Mozilla/5.0")
            .header(HttpHeaders.AUTHORIZATION, "Bearer 11111111")
            .accept(MediaType.APPLICATION_JSON)
            .contentType(MediaType.APPLICATION_FORM_URLENCODED)
            .retrieve()
            .bodyToMono(SaleResponse.class);

失败的请求：

MultiValueMap<String, String> map = new LinkedMultiValueMap<>();
        map.add("entityId", "1234567");
        map.add("amount", "92.00");
        map.add("currency", "GBP");
        map.add("paymentType", "DB");

            client.post()
                .uri(uriBuilder -> uriBuilder.path("https://test.oppwa.com/v1/checkouts")
                        .queryParams(map)
                        .build())
                .header(HttpHeaders.USER_AGENT, "Mozilla/5.0")
                .header(HttpHeaders.AUTHORIZATION, "Bearer 11111111")
                .accept(MediaType.APPLICATION_JSON)
                .contentType(MediaType.APPLICATION_FORM_URLENCODED)
                .retrieve()
                .bodyToMono(SaleResponse.class);

出于某种原因，webflux构造此值：

.WebClientResponseException$NotFound: 404 Not Found from POST https://test.oppwa.com/v1/checkoutshttps:/test.oppwa.com/v1/checkouts?entityId=1234567&amount=92.00&currency=GBP&paymentType=DB

你知道为什么url链接会重复两次吗？我怎样才能解决这个问题？