JSON parser: JSON data parsing proxy tool

What the heck is a JSON parser?

Anyone who has ever programmed must have seen this data format with curly braces, growing as densely as a centipede. It's calledJSONThe structure of the machine is actually for the machineList of informationThe server returns this kind of text data with key-value pairs. For example, if we look up a courier on a web page, the server will return this kind of text data with key-value pairs.

That's when you need atranslator (esp. oral), translating machine language into variables that the program can understand. It's like when you go to the market to buy food, you need to have a helper who can speak the dialect to help you cut the price. Common Python json module, Java's GSON these tools, do this work.

Why do I need a proxy IP for JSON parsing?

To give a real example: an e-commerce company to check the price of goods in bulk, directly with their own servers to send a wild request, the result is that not two days IP was blocked. At this time it is time toproxy IPComing out of the gate is like the martial arts novel of Transfiguration, where you change your vest every time you request so that the target site doesn't recognize who you are.

in particularLarge-scale data collectionThe dynamic residential agent of ipipgo can simulate the behavior of real users. Their IP pool covers more than 200 countries, and friends engaged in cross-border e-commerce use this to check exchange rate data especially convenient.

Hands-on teaching you how to play with proxies + parsing

Here's a chestnut in Python, suppose you want to capture the product information of a platform:

import requests
from json import JSONDecoder

 Proxy information from ipipgo
proxy = {
    'http': 'http://user:pass@gateway.ipipgo.com:9020',
    'https': 'https://user:pass@gateway.ipipgo.com:9020'
}

try.
    resp = requests.get('https://api.example.com/products',
                       proxies=proxy, timeout=5)
                       timeout=5)
    data = JSONDecoder().decode(resp.text)
    print(data['price'])
print(data['price'])) except Exception as e.
    print(f "Something went wrong: {str(e)}")

Focus on this.timeout settingIt is recommended not to exceed 8 seconds. If you use ipipgo's exclusive proxy, remember to set it in the background.Whitelist IP BindingThis way you don't have to enter your account password every time.

Common Pitfalls for Newbies

Pit 1: Proxy IP suddenly jerk
Suggest adding a retry mechanism to the code, like this:

for _ in range(3)::
    try.
         Request code...
        break
    except: continue
        continue

Pit 2: Returned data doesn't match
Some sites return JSON with special characters, remember to use theresp.encoding='utf-8'The tech support at ipipgo taught me a trick: add the following to the request header'Accept-Encoding': 'gzip'It can avoid the messy code caused by compressed data.

QA time

Q: How do I choose a proxy IP package?
A: Just use a shared pool for small scale testing, but if you're doing a serious project you'll have to use ipipgo's exclusive package. They have aCarryover of unused trafficThe policy is quite user-friendly, unlike some service providers that force a zero at the end of the month.

Q: What should I do if I encounter a 403 error?
A: First check if the proxy authorization is correct, and then try to switch country nodes. ipipgo has aIntelligent Routingfunction that automatically selects the fastest route.

Q：What is the datetime format error when parsing?
A: withjson.loads()(used form a nominal expression)object_hookparameter to handle special date formats, or have ipipgo's tech support tweak the proxy configuration for you.

Say something from the heart.

Using a proxy IP doesn't mean you can do whatever you want.Control request frequencyI've seen an Iron Bean send 20 requests per second in multiple threads. I've seen an Iron Bean open a multi-threaded request 20 times per second, even the best proxy can not carry so built. It is recommended to use a randomized sleep time to simulate the rhythm of a real person's operation.

Lastly, I'd like to introduce you to ipipgo'sAgent Management Panelthat can see IP usage in real time. They recently went live with aon-demand billingThe new model is especially suitable for freelance developers with irregular needs. Sign up with the promo codeJSON2023Being able to whore out a three-day trial is enough for you to test a small project.