Specifying an http proxy with spring-boot

Specifying an http proxy with spring-boot

To specify an HTTP proxy in a Spring Boot application, you need to configure your application to use the proxy settings. This can be done by setting the appropriate system properties either in your application code, via configuration files, or using command line arguments when starting your Spring Boot application.

Here are three common ways to set an HTTP proxy in a Spring Boot application:

1. Setting System Properties in the Application Code

You can set the proxy settings programmatically in your main method or in a configuration class:

import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication public class MySpringBootApplication { public static void main(String[] args) { System.setProperty("http.proxyHost", "proxy.example.com"); System.setProperty("http.proxyPort", "8080"); System.setProperty("https.proxyHost", "proxy.example.com"); System.setProperty("https.proxyPort", "8080"); SpringApplication.run(MySpringBootApplication.class, args); } }

2. Using application.properties or application.yml

You can specify system properties in your application.properties or application.yml file. However, keep in mind that not all Spring Boot properties will be picked up as system properties. You may need to configure the JVM to recognize these properties.

For application.properties:

system.http.proxyHost=proxy.example.com system.http.proxyPort=8080 system.https.proxyHost=proxy.example.com system.https.proxyPort=8080

For application.yml:

system: http: proxyHost: proxy.example.com proxyPort: 8080 https: proxyHost: proxy.example.com proxyPort: 8080

To make sure these properties are picked up as system properties, you might need to add the following to your application.properties file:

spring.application.name=my-spring-boot-app spring.main.allow-bean-definition-overriding=true # Set proxy properties as JVM system properties spring.application.system-properties[http.proxyHost]=proxy.example.com spring.application.system-properties[http.proxyPort]=8080 spring.application.system-properties[https.proxyHost]=proxy.example.com spring.application.system-properties[https.proxyPort]=8080

3. Setting Properties via Command Line Arguments

You can also set the proxy properties as command line arguments when starting your Spring Boot application:

java -Dhttp.proxyHost=proxy.example.com -Dhttp.proxyPort=8080 -Dhttps.proxyHost=proxy.example.com -Dhttps.proxyPort=8080 -jar my-spring-boot-app.jar

Example Spring Boot Configuration for RestTemplate

If you are using RestTemplate in your Spring Boot application, you can configure it to use the proxy as well:

import org.springframework.boot.web.client.RestTemplateBuilder; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.http.client.SimpleClientHttpRequestFactory; import org.springframework.web.client.RestTemplate; import java.net.InetSocketAddress; import java.net.Proxy; @Configuration public class AppConfig { @Bean public RestTemplate restTemplate(RestTemplateBuilder builder) { SimpleClientHttpRequestFactory factory = new SimpleClientHttpRequestFactory(); Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress("proxy.example.com", 8080)); factory.setProxy(proxy); return new RestTemplate(factory); } }

This example creates a RestTemplate bean configured to use the specified HTTP proxy.

Conclusion

These methods provide flexibility in specifying an HTTP proxy for your Spring Boot application. Choose the one that best fits your deployment and configuration management strategy.

Examples

  1. Configure HTTP proxy in Spring Boot application.properties

    Description: Configure an HTTP proxy for a Spring Boot application using application.properties.

    # Set HTTP proxy settings spring.application.proxy.host=your_proxy_host spring.application.proxy.port=your_proxy_port

    This configuration sets the HTTP proxy host (your_proxy_host) and port (your_proxy_port) in the application.properties file of your Spring Boot application.

  2. Specify HTTP proxy in Spring Boot application.yml

    Description: Specify an HTTP proxy using application.yml configuration in Spring Boot.

    # HTTP proxy configuration spring: application: proxy: host: your_proxy_host port: your_proxy_port

    This YAML configuration sets the HTTP proxy host (your_proxy_host) and port (your_proxy_port) under the spring.application.proxy section in the application.yml file.

  3. Set HTTP proxy programmatically in Spring Boot

    Description: Programmatically configure an HTTP proxy in Spring Boot using RestTemplate.

    import org.springframework.beans.factory.annotation.Value; import org.springframework.boot.web.client.RestTemplateBuilder; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.web.client.RestTemplate; @Configuration public class AppConfig { @Value("${spring.application.proxy.host}") private String proxyHost; @Value("${spring.application.proxy.port}") private int proxyPort; @Bean public RestTemplate restTemplate(RestTemplateBuilder builder) { return builder .proxy(proxyHost, proxyPort) .build(); } }

    This Java code snippet configures a RestTemplate bean with an HTTP proxy host (proxyHost) and port (proxyPort) using Spring Boot's dependency injection and RestTemplateBuilder.

  4. Spring Boot proxy configuration for WebClient

    Description: Configure an HTTP proxy for WebClient in Spring Boot.

    import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.web.reactive.function.client.ClientHttpConnector; import org.springframework.web.reactive.function.client.WebClient; import org.springframework.web.reactive.function.client.WebClient.Builder; import org.springframework.http.client.reactive.ClientHttpConnector; @Configuration public class WebClientConfig { @Value("${spring.application.proxy.host}") private String proxyHost; @Value("${spring.application.proxy.port}") private int proxyPort; @Bean public WebClient webClient() { ClientHttpConnector connector = new ProxyHandler(proxyHost, proxyPort); return WebClient.builder().clientConnector(connector).build(); } }

    This Java configuration sets up a WebClient bean with an HTTP proxy using ClientHttpConnector for connecting through a proxy server in Spring Boot.

  5. Spring Boot proxy configuration for Apache HttpClient

    Description: Configure Apache HttpClient with an HTTP proxy in Spring Boot.

    import org.apache.http.HttpHost; import org.apache.http.client.HttpClient; import org.apache.http.impl.client.HttpClients; import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.http.client.HttpComponentsClientHttpRequestFactory; import org.springframework.web.client.RestTemplate; @Configuration public class HttpClientConfig { @Value("${spring.application.proxy.host}") private String proxyHost; @Value("${spring.application.proxy.port}") private int proxyPort; @Bean public RestTemplate restTemplate() { HttpHost proxy = new HttpHost(proxyHost, proxyPort); HttpClient client = HttpClients.custom() .setProxy(proxy) .build(); return new RestTemplate(new HttpComponentsClientHttpRequestFactory(client)); } }

    This Java configuration demonstrates setting up a RestTemplate with Apache HttpClient configured to use an HTTP proxy (proxyHost and proxyPort) in Spring Boot.

  6. Spring Boot proxy configuration for OkHttpClient

    Description: Configure OkHttpClient with an HTTP proxy in Spring Boot.

    import okhttp3.OkHttpClient; import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.http.client.OkHttp3ClientHttpRequestFactory; import org.springframework.web.client.RestTemplate; @Configuration public class OkHttpClientConfig { @Value("${spring.application.proxy.host}") private String proxyHost; @Value("${spring.application.proxy.port}") private int proxyPort; @Bean public RestTemplate restTemplate() { OkHttpClient.Builder builder = new OkHttpClient.Builder() .proxy(new java.net.Proxy(java.net.Proxy.Type.HTTP, new InetSocketAddress(proxyHost, proxyPort))); return new RestTemplate(new OkHttp3ClientHttpRequestFactory(builder.build())); } }

    This Java configuration sets up a RestTemplate with OkHttpClient configured to use an HTTP proxy (proxyHost and proxyPort) in Spring Boot.

  7. Spring Boot proxy configuration for Feign Client

    Description: Configure Feign Client with an HTTP proxy in Spring Boot.

    import feign.Client; import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.cloud.openfeign.support.ResponseEntityDecoder; import org.springframework.cloud.openfeign.support.SpringDecoder; import org.springframework.cloud.openfeign.support.SpringEncoder; import org.springframework.cloud.openfeign.Feign; import org.springframework.web.client.RestTemplate; @Configuration public class FeignConfig { @Value("${spring.application.proxy.host}") private String proxyHost; @Value("${spring.application.proxy.port}") private int proxyPort; @Bean public Feign.Builder feignBuilder() { Client proxyClient = new Client.Default(new InetSocketAddress(proxyHost, proxyPort), 0); return Feign.builder() .client(proxyClient) .encoder(new SpringEncoder()) .decoder(new ResponseEntityDecoder(new SpringDecoder())); } }

    This Java configuration sets up a Feign Client with an HTTP proxy (proxyHost and proxyPort) in Spring Boot for making HTTP requests.

  8. Spring Boot proxy configuration for RestTemplate

    Description: Configure RestTemplate with an HTTP proxy using SimpleClientHttpRequestFactory in Spring Boot.

    import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.http.client.SimpleClientHttpRequestFactory; import org.springframework.web.client.RestTemplate; @Configuration public class RestTemplateConfig { @Value("${spring.application.proxy.host}") private String proxyHost; @Value("${spring.application.proxy.port}") private int proxyPort; @Bean public RestTemplate restTemplate() { SimpleClientHttpRequestFactory factory = new SimpleClientHttpRequestFactory(); factory.setProxy(new java.net.Proxy(java.net.Proxy.Type.HTTP, new InetSocketAddress(proxyHost, proxyPort))); return new RestTemplate(factory); } }

    This Java configuration demonstrates setting up a RestTemplate with SimpleClientHttpRequestFactory configured to use an HTTP proxy (proxyHost and proxyPort) in Spring Boot.

  9. Spring Boot proxy configuration for WebClient with WebClient.Builder

    Description: Configure WebClient with an HTTP proxy using WebClient.Builder in Spring Boot.

    import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.http.client.reactive.ClientHttpConnector; import org.springframework.web.reactive.function.client.WebClient; import org.springframework.web.reactive.function.client.ExchangeStrategies; @Configuration public class WebClientConfig { @Value("${spring.application.proxy.host}") private String proxyHost; @Value("${spring.application.proxy.port}") private int proxyPort; @Bean public WebClient.Builder webClientBuilder() { ClientHttpConnector connector = new ProxyHandler(proxyHost, proxyPort); return WebClient.builder().clientConnector(connector); } }

    This Java configuration sets up WebClient.Builder with an HTTP proxy using ClientHttpConnector for connecting through a proxy server in Spring Boot.

  10. Spring Boot proxy configuration for @FeignClient

    Description: Configure @FeignClient with an HTTP proxy in Spring Boot using Feign Client.

    import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import feign.Client; import org.springframework.cloud.openfeign.FeignClient; @Configuration public class FeignClientConfig { @Value("${spring.application.proxy.host}") private String proxyHost; @Value("${spring.application.proxy.port}") private int proxyPort; @Bean public Client feignClient() { return new Client.Default(new java.net.Proxy(java.net.Proxy.Type.HTTP, new InetSocketAddress(proxyHost, proxyPort)), 0); } }

    This Java configuration sets up @FeignClient with an HTTP proxy (proxyHost and proxyPort) in Spring Boot using Feign Client.

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