proxy | 易学教程

Java动态代理与CGLIB

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1. 静态代理模式因为需要对一些函数进行二次处理，或是某些函数不让外界知道时，可以使用代理模式，通过访问第三方，间接访问原函数的方式，达到以上目的，来看一下代理模式的类图： interface Hosee{ String sayhi(); } class Hoseeimpl implements Hosee{ @Override public String sayhi() { return "Welcome oschina hosee's blog"; } } class HoseeProxy implements Hosee{ Hosee h; public HoseeProxy(Hosee h) { this.h = h; } @Override public String sayhi() { System.out.println("I'm proxy!"); return h.sayhi(); } } public class StaticProxy { public static void main(String[] args) { Hoseeimpl h = new Hoseeimpl(); HoseeProxy hp = new HoseeProxy(h); System.out.println(hp.sayhi()); } } 1.1 静态代理的弊端

Thymeleaf template (in Spring boot application) behind reverse proxy not forming url's correctly

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问题 I have some trouble getting Thymeleaf to form relative URL's correctly when it is used on a server behind a reverse proxy (nginx in my case). Let's say I have the following location in nginx: location /app { proxy_pass http://10.0.0.0:8080; } I have the following Thymeleaf 3 page ( index.html ): <html xmlns:th="http://www.thymeleaf.org"> <head> <link rel="stylesheet" th:href="@{/css/some.css}" /> </head> <body> Hello world! </body> </html> The server used is an embedded Tomcat server (Spring

Thymeleaf template (in Spring boot application) behind reverse proxy not forming url's correctly

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Kotlin instance variable is null when accessed by Spring proxied class

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问题 I have a service class that is being proxied by Spring, like so: @Service @Transactional open class MyService { ... } If I remove the open modifier, Spring complains that it needs to proxy the class to apply the @Transactional annotation tweaks. However, this is causing issues when calling a function on the proxied service, which attempts to access a variable: @Service @Transactional open class MyService { protected val internalVariable = ... fun doWork() { internalVariable.execute() //

Kotlin instance variable is null when accessed by Spring proxied class

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Spring AOP pointcut expression method with 0 or more argument of any type throws java.lang.NullPointerException

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问题 I'm following a tutorial where I'm trying to use a Spring AOP pointcut expression method that accepts 0 or more arguments of any type but I'm getting a java.lang.NullPointerException. I am using Spring MVC and maven along with eclipse. Everything is working fine if I use: @Before("execution(* add*())") or @Before("execution(* add*(*))") or @Before("execution(* add*(boolean,..))") but the moment I use ".." alone @Before("execution(* add*(..))") to mean that I want that the pointcut expression

How to set different IP according to different commands of one single scrapy.Spider?

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问题 I have a bunch of pages to scrape, about 200 000. I usually use Tor and Polipo proxy to hide my spiders behaviors even if they are polite, we never know. So if I login this is useless to use one account and change IP. So that is why I can create several accounts on the website and to set my spider with arguments like in the following: class ASpider(scrapy.Spider): name = "spider" start_urls = ['https://www.a_website.com/compte/login'] def __init__ (self, username=None, password=None): self

How to properly return http response from Python Requests library (want a Python reverse proxy)

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问题 This question continues from here. I want to create a reverse proxy of sorts that will allow me to host an application that runs on a specified port on a server that does not have that port open. But I do not want take over ports 80/443 because I need to have other apps running on that server. Instead, I want an app running at localhost:#### to be served from a suburl or subdomain such as http://myserver/myapp . Here is what I tried: helloflask.py #!/usr/bin/env python from flask import Flask

What is the use of Use Proxy Integration in API Gateway Integration?

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问题 I am trying to make a integration between API Gateway API and a resource behind VPC. While creating the integration, there is a option to select, "Use Proxy Integration". Even if I am not selecting this check box and deploy the API, I am able to make the API Gateway connectivity working via NLB to the target resource behing VPC. So, I am having difficulty in understanding still why we need to select the check box. 来源： https://stackoverflow.com/questions/59917934/what-is-the-use-of-use-proxy

How to create a dynamic proxy using ByteBuddy

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问题 In Java it is possible to create dynamic proxies using an implementation of InvocationHandler . Despite JVM optimizations, using reflection will always have some overhead invoking a method. To try to solve this problem, I tried to use ByteBuddy to create the proxy classes at runtime, but the documentation didn't seem clear enough on this aspect. How do I create a MethodCallProxy in order to forward a method invocation to some class instance? Edit: To better clarify my problem, I am providing