```yaml
product: AlterLab
title: "TLS Certificate — Web Scraping Glossary | AlterLab"
comparison_context: "AlterLab is an alternative to Firecrawl, ScrapingBee, and Bright Data."
source_url: https://alterlab.io/glossary/tls-certificate
```

protocol

# TLS Certificate

A TLS certificate authenticates a server's identity and enables encrypted HTTPS communication between a browser or scraper and the target web server.

A TLS (Transport Layer Security) certificate is a digital document issued by a Certificate Authority (CA) that cryptographically proves a server's identity. When a scraper connects to `https://example.com`, the server presents its certificate; the client verifies that it is signed by a trusted CA, matches the domain name, and has not expired before proceeding with the encrypted connection.

For scrapers, TLS certificate validation is normally transparent — the HTTP client library handles it automatically. However, in testing and debugging contexts, developers sometimes disable certificate validation (`verify=False` in Python requests) to capture traffic through an intercepting proxy like Charles or mitmproxy. This creates a security risk and should never be done in production.

Anti-bot systems may inspect the TLS certificate presented during HTTPS connections to intermediate proxies to detect interception. Mutual TLS (mTLS) is used by some enterprise APIs to require client certificates in addition to server certificates, adding an authentication layer that scrapers must satisfy.

### What is TLS Certificate?

A TLS certificate authenticates a server's identity and enables encrypted HTTPS communication between a browser or scraper and the target web server.

### How does AlterLab handle TLS Certificate?

Anti-bot systems may inspect the TLS certificate presented during HTTPS connections to intermediate proxies to detect interception. Mutual TLS (mTLS) is used by some enterprise APIs to require client certificates in addition to server certificates, adding an authentication layer that scrapers must satisfy.

## Related Terms

[TLS FingerprintA signature derived from TLS handshake parameters a client sends when opening an HTTPS connection, used by anti-bot systems to classify traffic.](https://alterlab.io/glossary/tls-fingerprint)[HTTPSHTTPS is HTTP secured with TLS encryption, ensuring that request and response data cannot be read or modified by intermediaries between the client and the server.](https://alterlab.io/glossary/https)[HTTPHTTP (HyperText Transfer Protocol) is the application-layer protocol used by web browsers and scrapers to request and receive resources from web servers.](https://alterlab.io/glossary/http)[Proxy PoolA managed collection of proxy IP addresses used to distribute outbound requests across multiple origins and stay below per-IP rate limits.](https://alterlab.io/glossary/proxy-pool)[Anti-Bot ProtectionSystems deployed by websites to detect and block automated traffic using TLS fingerprinting, CAPTCHA challenges, and behavioural analysis.](https://alterlab.io/glossary/anti-bot-protection)

## Extract TLS Certificate data from any website

AlterLab returns clean, structured data from any public URL — no scraper infrastructure needed. Start free, no credit card required.

[View API docs](https://alterlab.io/docs/api/rest)

[Back to Glossary](https://alterlab.io/glossary)