我正在尝试请求项目的外部服务，我可以将它 curl 到dedocker容器中并放在代理后面，然后得到有效的响应。

// Request example
curl https://api.something.com

请求是https。
但是，当从java代码（在容器内）发出请求时，我会超时得到http503。
tldr：我认为问题是…代理没有应用到java/spring引导上。
我的application.properties是：

server.address=0.0.0.0

我在.mvn/jvm.config上设置了代理变量，只用于下载maven包。

-Dhttp.proxyHost=<proxy_host>
-Dhttp.proxyPort=<proxy_port>
-Dhttps.proxyHost=<proxy_host>
-Dhttps.proxyPort=<proxy_port>

我还尝试添加jvm.config：

-Dhttp.setProxy=true
-Dhttps.setProxy=true
-Djava.net.useSystemProxies=true

但是由于某些原因，配置没有应用到代码上。

public T getRequest(String url, Class<T> typeClass) {
        try {
            ResponseEntity<T> responseEntity = this.REST_TEMPLATE.getForEntity(url, typeClass);
            return responseEntity.getBody();
        } catch (HttpClientErrorException e) {
            throw new ResponseStatusException(e.getStatusCode(), e.getResponseBodyAsString());
        } catch (RuntimeException e) {
            throw new ResponseStatusException(HttpStatus.SERVICE_UNAVAILABLE, "Serviço indisponivel", e);
        }
}

我还尝试在resttemplate构造函数上添加代理变量（503 by timeout）：

InetSocketAddress inetSocketAddress = new InetSocketAddress(this.PROXY_HOST, this.PROXY_PORT);
Proxy proxy = new Proxy(Proxy.Type.HTTP, inetSocketAddress);
SimpleClientHttpRequestFactory requestFactory = new SimpleClientHttpRequestFactory();
requestFactory.setProxy(proxy);
this.REST_TEMPLATE = new RestTemplate(requestFactory);

我的dockerfile是：

FROM maven:3.6.3-jdk-11-slim

ENV https_proxy <proxy_host>:<proxy_port>
ENV http_proxy <proxy_host>:<proxy_port>
ENV HTTP_PROXY <proxy_host>:<proxy_port>
ENV HTTPS_PROXY <proxy_host>:<proxy_port>

WORKDIR /app
COPY ./ /app/
RUN mvn package
ARG JAR_FILE=target/*.jar
COPY ${JAR_FILE} app.jar
ENTRYPOINT ["java","-jar","app.jar"]

我的pom.xml是：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>something</groupId>
    <artifactId>something</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>something</name>
    <description>something</description>

    <properties>
        <java.version>11</java.version>
    </properties>

    <dependencies>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>io.jsonwebtoken</groupId>
            <artifactId>jjwt</artifactId>
            <version>0.9.1</version>
        </dependency>

        <dependency>
            <groupId>javax.xml.bind</groupId>
            <artifactId>jaxb-api</artifactId>
            <version>2.3.0</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-test</artifactId>
            <scope>test</scope>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>2.3.4.RELEASE</version>
            </plugin>
        </plugins>
    </build>

</project>

如前所述，我可以在容器中毫无问题地 curl 服务，但是如果我在dockerfile中添加no\u proxy变量，我也可以从 curl 中超时得到503。
所以我认为问题是…代理没有应用到java上。
有人能帮我吗？java/spring引导配置有时非常混乱。