curl crawling data using proxies: the complete command manual

Teach you how to use curl to hang a proxy to grab data.

Anyone who works with web crawlers knows thatIP blocking is a common occurrence. This time it is necessary to rely on the proxy IP to renew the life. Today we will chatter how to use curl as a command line tool, with ipipgo's proxy service, to grab data steadily.

Curl basic operation crash course

Let's start with something hardcore, the basic position of curl looks like this:

curl https://目标网站.com

But running around naked like this will get you banned from the site in minutes. It's like going to the grocery store and trying to eat at the same counter a dozen times, and the security guards won't kick you out.

Putting a proxy vest on curl

Here's the kicker! Generic template for putting proxy vests on curl:

curl -x http://用户名:密码@proxy:port -L Destination URL

A real example (demonstrated with ipipgo's service):

curl -x http://user123:pass456@gateway.ipipgo.io:8899 -L https://target-site.com/data.json

Note three key points:

How to choose a reliable proxy IP service

Proxy services on the market are a mixed bag, here must be amenable to a few hardcore advantages of their own product ipipgo:

• Dynamic IP pool updated with 2 million+ IPs per day
• Nationwide coverage of 200+ city nodes
• 独家智能路由技术，低至20ms

Especially if you are doing a long term crawler project, use theirLong-lasting static residential IPStability pulls straight through.

Operational demining guide

Here are all the potholes that newbies often step into:

1. Proxy address written in wrong format (correct format: http://用户名:密码@domain:port)
2. Forgetting to add the -L parameter causes redirection failure
3. Didn't deal with SSL certificate issues (added -k parameter to skip validation)

It is recommended that you first verify that the proxy is working using the test interface:

curl -x http://代理信息 -L https://httpbin.org/ip

Frequently Asked Questions First Aid Kit

Q: Why does it return 407 Agent Authentication Error?
A: ninety percent is the user name password lost wrong, it is recommended to go to the ipipgo background of the [key management] to re-generate the

Q: How can I tell if a proxy is in effect?
A: Compare whether the IP address returned by httpbin.org/ip changes when the proxy is used or not

Q: What should I do if I encounter frequent timeouts?
A: Switching in the ipipgo consoleIntelligent Routing ModeAutomatically selects the optimal node

Tips for Advanced Players

For a more silky smooth operation try these tips:

 Set timeout in seconds
curl -x proxy address --max-time 30 Destination URL

 Automatically retry 3 times
curl -x proxy --retry 3 Target URL

 Disguise browser logo
curl -x proxy -A "Mozilla/5.0..." Target URL

With ipipgo'sRequest Frequency Adaptation FunctionIt is a perfect simulation of the rhythm of a real person's operation.

Say something from the heart.

Using a proxy IP is not a panacea, the key is still toCompliance with web crawler protocols. It is recommended to work with ipipgo'sCompliance model, automatically controls the frequency of requests. When it comes to troubleshooting directly to their technical support, the response time is faster than a delivery boy.

Lastly, I'd like to throw in a perk: use the promo code on the ipipgo website.CURL666New subscribers will get a direct fracture in the first month. Well no more nonsense, hurry up to the actual practice!