urllib3 vs httpx

Side-by-side — pricing, strengths, tradeoffs, and fit.

urllib3

A HTTP library with thread-safe connection pooling and file post support.

httpx

A next generation HTTP client for Python.

At a glance

Open SourceFree Tier
● Established·From $0
Open SourceFree Tier
● Established·From $0

Overview

One-liner

A HTTP library with thread-safe connection pooling and file post support.

One-liner

A next generation HTTP client for Python.

Maturity

Established

Maturity

Established

Open source

✓ Yes

Open source

✓ Yes

Pricing

Free tier

✓ Available

Open source — free to use

Free tier

✓ Available

Open source — free to use

Starts at

$0

Starts at

$0

Model

Flat rate

Model

Flat rate

Enterprise

✕ None

Enterprise

✕ None

Best for

✓ Best for

Developers needing a robust and thread-safe HTTP client for Python
Projects requiring efficient connection pooling to manage multiple requests
Applications that need to handle file uploads via HTTP POST

✓ Best for

Developers building modern, high-performance HTTP clients for their applications
Teams requiring both synchronous and asynchronous HTTP requests within the same project

Not ideal for

✕ Not for

Scenarios where a full-featured web framework with built-in HTTP capabilities is preferred over a standalone library
Use cases requiring non-Python language support, as urllib3 is Python-specific

✕ Not for

Projects that require a web UI or platform-based interaction with HTTP services
Applications needing extensive customization beyond what httpx offers out-of-the-box

Strengths

↑ Strengths

Thread-safe connection pooling
File posting support
Robust error handling and retries
SSL certificate verification

↑ Strengths

Support for both synchronous and asynchronous operations
Automatic handling of redirects, retries, and timeouts
Built-in support for HTTP/2 and HTTP/1.1

Weaknesses

↓ Weaknesses

Lack of comprehensive documentation
Performance issues under heavy load
Limited support for modern HTTP/2 features

↓ Weaknesses

Limited documentation for advanced features
Performance issues under heavy load
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