Browser Proxy Plugin: Browser Proxy Plugin Development Guide

What does the browser proxy plugin actually do?

Many friends do not understand why to toss the proxy plug-in, to cite a real scenario: to do cross-border e-commerce to check the price of goods in different countries, to do the development of reptiles to prevent the IP is blocked, there are testers have to verify the speed of access to various places. At this time manually change the system proxy is too much trouble, browser plug-ins areOn/Off switchThe

Off-the-shelf plugins on the market are either expensive or opaque in their functionality. If you develop it yourself, not only can youCustomizing proxy rulesIt can also be combined with your own business to do special processing. For example, for some sites automatically switch IP, or record proxy usage logs.

Three things you must understand before development

1. Choose the right type of agent:
Dynamic IP is suitable for scenarios that require frequent changes (e.g., data collection), and static IP is suitable for scenarios that require stable connections (e.g., automated testing)

2. Make no mistake about protocol matching:

3. Authentication methods to be compatible:
Some proxy services require account password authentication, so remember to leave theVoucher Entry Window. A sample code is given here:

function setProxy(ip, port, username, password) {
  const config = {
    mode: "fixed_servers", rules: {
    rules: {
      singleProxy: {
        scheme: "http",
        host: ip,
        port: parseInt(port)
      }
    }
  }
  if(username && password) {
    config.auth = {
      config.auth = { user: username,
      pass: password
    }; }
  }
  chrome.proxy.settings.set({value: config, scope: 'regular'});
}

The right way to access ipipgo

Highly recommend using ipipgo's API here, their homeDynamic Residential IP PoolParticularly suitable for plug-in development. Three-step access method:

1. First apply for the API key (note that the special package for browser plug-ins)
2. Call the Get Agent interface:

fetch('https://api.ipipgo.com/proxy?type=dynamic&country=us', {
  headers: {'Authorization': 'Bearer your_api_key'}
})

3. Automatic rotation mechanism should be added: it is recommended to set up automatic IP change every 10 minutes or every 100 requests to avoid being recognized by the target website.

A guide to common pitfalls for white people

Q: The plugin is installed but the agent does not work?
A: First check if manifest.json declares proxy permissions:
"permissions": ["proxy"]

Q: How to realize the automatic switching of proxy for sub-sites?
A: Use the chrome.declarativeNetRequest interface and set up conditional rules:

chrome.runtime.onMessage.addListener((request) => {
  if(request.action === 'setProxyForDomain') {
    chrome.declarativeNetRequest.updateDynamicRules({
      addRules: [{
        id: 1,
        condition: {
          domains: [request.domain], { resourceTypes: ['mains.domain'], {
          resourceTypes: ['main_frame']
        },
        action: {
          type: 'redirect', redirect: { domains: [request.domain], resourceTypes: ['main_frame'] }, action: {
          redirect: {
            extensionPath: '/proxy.html?ip='+request.ip
          }
        }
      }]
    });
  }
}).

Why choose ipipgo without stepping on the line?

Having tested multiple vendors, ipipgo has three killer features:
- exclusiveTK LineI can get the latency down to 200ms or less.
- be in favor ofvolumetric billingThe plug-in is the most cost-effective for this intermittent use scenario
- Fast technical response to problems, the last time I raised a work order at 3:00 a.m. actually returned in seconds!

Beginners are advised to start withDynamic Residential (Standard) PackageGetting started, $7.67/GB is enough to test for most of the month. You need a fixed IP and then a static residence, don't be stupid and buy the enterprise version directly.

Frequently Asked Questions That Can't Be Avoided

Q: Does the plugin need to be on the app store?
A: For personal use, just load the unzipped package directly, and corporate users are recommended to load the package for easy distribution.

Q: How are multi-threaded requests handled?
A: It is recommended to bind a separate proxy IP for each tab and use the chrome.tabs API to manage the session

Q: What should I do if the agent often drops out?
A: two tricks: ① turn on the heartbeat detection function of ipipgo ② set up the automatic retry mechanism for failure (don't exceed 3 times)

One last reminder: remember to use the test phaseFree trial credit for ipipgo, don't be stupid and just charge it. Their customer service girls are super patient and ask technical questions, much better than some of the vendors that yank on them.