How does a crawler act as a proxy ip

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1. Acquisition of proxy IP

It can be obtained from the following ways:

1) Free IP.

Get it from free websites, low quality, very few IPs available

2. Charging agent.

For paid proxy services, the quality is much higher

3. Build proxy server.

Build your own proxy server, stable, but requires a lot of server resources.

The proxy IP pool in this article is obtained from multiple free websites by crawler in advance, and then checked to determine whether the IP is available. If it is available, it will be stored in MongoDB and finally displayed on the front page.

Second, get the available Proxy

The core code of the proxy is ProxyManager, which is implemented in RxJava2 and mainly does the following things:

1. Create ParallelFlowable.

Crawl in parallel for each page that offers free proxy IP.

2. Capture each page.

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3. IP verification.

Check the proxy IP list obtained from each page to determine whether it is available

4. Save to proxyList in turn.

When doing crawlers, it is necessary to maintain an available proxy IP pool. Of course, it is better to consider high-quality proxy IP if you want to pursue higher stability.

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