Fetch API Application: A Guide to Proxy IP Settings for Cross-Domain Requests

Fetch request blocked? Try this proxy IP solution

One of the biggest headaches of front-end development is that browsers are not allowed to send cross-domain requests. At this time, do not be in a hurry and the back end of the fight, let's think differently - with a proxy IP directly bypass the cross-domain restrictions. To give a chestnut, as you shop online when the courier was blocked by the neighborhood access control, find a collection point (proxy server) will be able to successfully get the package.

Hands-on configuration of proxy IP

Take the Fetch API as an example, just add the proxy IP parameter in the request header. Note that you have to use theipipgo's TK Dedicated Servicethat specializes in solving such scenarios that require a stable connection:

fetch('https://你的目标地址', {
  headers: {
    'Proxy-Authorization': 'Basic ' + btoa('ipipgo account:password'),
    'X-Proxy-IP': 'IP:Port via ipipgo API'
  }
})
.then(response => response.json())

Here's the point! Remember to put the proxy information in therequest headerInstead of in the URL, it's secure and won't be recognized by the target server as anomalous traffic. ipipgo's client handles encrypted transfers automatically, which is much less work than writing your own proxy relay service.

Guide to avoiding the pit: 3 common mistakes made by newbies

1. IP Reuse: The same IP will be blocked for continuous requests, it is recommended to use dynamic residential packages to switch IPs automatically!
2. Protocol mismatch: If the target site uses HTTPS, you must configure an HTTPS proxy.
3. timeout setting: It is recommended to set the timeout to more than 15 seconds for overseas requests.

Why do you recommend ipipgo?

Having tested 7 service providers on the market, I finally locked in on ipipgo for the top 3 reasons:
- Enterprise Package9.47 Yuan/GBYou'll be able to use a dedicated IP pool
- Client comes withIntelligent Route SwitchingThe fastest node is automatically selected.
- Tech support responds to work orders in seconds, and the last time I asked a question at 3:00 a.m., someone was actually on duty.

Frequently Asked Questions QA

Q: What should I do if the proxy IP suddenly fails to connect?
A: First use the diagnostic tool that comes with the ipipgo client, 80% problems can be fixed automatically. If the abnormality persists, it is recommended to switch to the TK private line package

Q: What if I need to call multiple APIs at the same time?
A: In the fetch request header addX-Proxy-Group: Group nameWith the IP pool grouping function of the Enterprise Edition package, different IPs can be automatically assigned to different lines of business.

Q: Do free proxies work?
A: Never! We have suffered from free proxies that are either slow to tears or secretly inject ad code. ipipgo new users have3 Dollar Trial PackIt's a lot more reliable than using a free one

Advanced Tips: Dynamic IP Rotation

Use this code to implement automatic IP switching when large-scale requests are needed:

async function rotateFetch(url, retries=3) {
  const proxy = await getIpipgoProxy() // Call the ipipgo API to fetch the new IP.
  try {
    return await fetch(url, {
      headers: {'X-Proxy-IP': proxy.ip_port}
    })
  } catch(e) {
    if(retries > 0) return rotateFetch(url, retries-1)
    throw e
  }
}

With the Dynamic Residential Package, it has been tested that it can automatically switch every hour500+ valid IPsYou don't have to worry about your IP being blocked. Remember to set the switching frequency in the console, do not adjust too fast instead of triggering the wind control.