Do these 3 things before closing this tab:
1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsChoose Requests for straightforward synchronous Python code, HTTPX when you want both sync and async APIs or an HTTP/2 option, and aiohttp when its async-first client and session lifecycle fit your application. None is a universal performance winner: the official feature and lifecycle documentation does not establish a controlled speed comparison. Whichever you choose, reuse a client or session for repeated requests and set timeouts intentionally.
How the three clients differ
All three libraries send HTTP requests, but they suit different programming models. Requests is the synchronous baseline. HTTPX offers synchronous and asynchronous interfaces, along with optional HTTP/2 support. aiohttp is an async-first client whose session, response, and body-reading lifecycle is designed around asynchronous code.
| Choice | Programming model | Notable fit |
|---|---|---|
| Requests | Synchronous | Conventional request/response code in a synchronous application. |
| HTTPX | Synchronous and asynchronous | A project that benefits from either interface, or needs HTTP/2 as an option. |
| aiohttp | Async-first | An asynchronous application that fits its session and awaited response lifecycle. |
These are differences in documented capabilities and usage, not benchmark scores. The best fit depends on the surrounding application, concurrency model, and requirements.
What the programming models mean in practice
Requests: direct synchronous calls
With Requests, a call runs synchronously: execution waits for the response before moving on. This is often the clearest choice for scripts, command-line utilities, and applications that are themselves synchronous. A requests.Session provides a persistent, stateful interface for repeated requests.
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HTTPX: sync or async with a related interface
HTTPX provides both Client and AsyncClient. The async form uses await for requests and asynchronous context management for resource cleanup. HTTPX supports asyncio and Trio. Its synchronous and asynchronous options can be useful when a codebase needs both models, though each part of an application should still use the model appropriate to its runtime.
aiohttp: async requests and separately awaited bodies
aiohttp’s client is organized around ClientSession. Making a request obtains the response headers; reading the response payload is a separate asynchronous operation. Context managers help close both responses and sessions. That explicit lifecycle can suit an async application, but it is a different shape from a simple synchronous Requests call.
HTTP/2, connection reuse, and redirects
HTTP/2 is an HTTPX option, not a guarantee
HTTPX supports HTTP/2, but it is disabled by default. Enable it with http2=True; the server must also support HTTP/2. A setting alone does not prove that a particular request used the protocol. Inspect response.http_version for the negotiated response version. HTTP/2 multiplexing can carry multiple concurrent streams over one TCP connection, but whether that matters depends on the server and workload.
The cited aiohttp client reference documents HTTP/1.1. That is not a basis for making claims about unreviewed releases or future support. The cited sources likewise do not establish Requests as an HTTP/2 client.
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Reuse stateful clients for repeated requests
HTTPX Client and AsyncClient pool connections. aiohttp ClientSession manages a connection pool and shared state such as cookies, headers, and timeout configuration. A Requests Session is the analogous persistent interface. Reusing these objects for repeated work avoids constructing a fresh client for every request; HTTPX specifically warns that repeatedly creating clients in a hot loop prevents the intended pooling benefits.
Redirect defaults differ
HTTPX does not follow redirects by default. aiohttp’s documented request interface allows redirects by default. The reviewed comparison does not establish a comprehensive Requests redirect comparison, so verify its behavior and your own configuration rather than assuming all three have matching defaults. When migrating, test redirects explicitly, especially if the application depends on the final URL or response status.
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Timeouts are not equivalent across libraries
Timeout values that share a number may represent different things. In particular, do not compare a network-inactivity timeout directly with a total request timeout as if they measured the same interval.
| Library | Documented default | What to account for |
|---|---|---|
| HTTPX | Raises a timeout exception after five seconds of network inactivity. | It has separate connect, read, write, and pool timeout categories. |
| Requests | No timeout by default. | Set a timeout appropriate to the workload; a request can otherwise wait without a library default limiting it. |
| aiohttp | The aiohttp 3.13.5 quickstart documents a 300-second total timeout and a 30-second socket-connect timeout. | These are different timeout dimensions. Confirm defaults for the installed release. |
For production, select explicit limits based on expected server response times, connection behavior, and whether the operation is interactive or background work. HTTPX’s five seconds is an inactivity default, not a statement that every request must complete within five seconds. The aiohttp values above are version-specific documentation defaults, not universal settings for every release.
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Small examples of the request lifecycle
These examples show the basic shape of each library. They use https://example.com as a placeholder target; replace it with the endpoint your application is authorized to call. For production, configure the timeout and error handling that match your use case.
Requests
import requests
with requests.Session() as session:
response = session.get("https://example.com", timeout=10)
response.raise_for_status()
print(response.status_code)
print(response.text[:200])The explicit timeout matters because Requests does not provide a timeout by default. A session is useful when the same code makes repeated requests.
HTTPX, synchronous
import httpx
with httpx.Client(timeout=10) as client:
response = client.get("https://example.com")
response.raise_for_status()
print(response.status_code)
print(response.http_version)
print(response.text[:200])HTTPX, asynchronous
import asyncio
import httpx
async def main():
async with httpx.AsyncClient(timeout=10) as client:
response = await client.get("https://example.com")
response.raise_for_status()
print(response.status_code)
print(response.http_version)
print(response.text[:200])
asyncio.run(main())For HTTP/2, use httpx.AsyncClient(http2=True, timeout=10) or the corresponding synchronous client. The server must support it, and response.http_version is the check for what the response actually used.
aiohttp
import asyncio
import aiohttp
async def main():
timeout = aiohttp.ClientTimeout(total=10)
async with aiohttp.ClientSession(timeout=timeout) as session:
async with session.get("https://example.com") as response:
response.raise_for_status()
body = await response.text()
print(response.status)
print(body[:200])
asyncio.run(main())The response body is read with await, separately from obtaining the response. The session and response context managers make their lifetimes visible and help release resources.
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How to choose for your application
- Use Requests if your code is synchronous and a familiar, direct client is what you need.
- Use HTTPX if a project needs both sync and async interfaces, or HTTP/2 as an opt-in capability.
- Use aiohttp if the application is async and its session pooling and asynchronous response handling match the rest of the design.
Before choosing for a particular service, list the actual requirements: concurrency model, protocol needs, repeated-request volume, streaming or body handling, redirect expectations, proxy configuration, TLS setup, and timeout policy. Then validate those requirements using the documentation for the exact installed release.
Migrating between clients
Similar-looking request calls can conceal behavior changes. HTTPX’s compatibility guide describes httpx.Client() as generally equivalent to requests.Session(), but highlights differences that should be audited during migration.
- Timeouts: Requests has no timeout by default; HTTPX applies default timeouts. Add explicit timeouts rather than inheriting assumptions from the old client.
- Redirects: HTTPX does not follow redirects by default. Test flows that previously relied on redirects, and set the behavior your application requires.
- Proxy and transport routing: The cited compatibility guide describes Requests’
proxiesconvention and HTTPX’smountsfor routing transports. Review the target library’s current configuration rather than mechanically renaming an argument. - Async boundaries: Moving to HTTPX’s
AsyncClientor aiohttp changes request calls and response-body handling to awaited operations. Keep async resources within an appropriate lifecycle rather than creating them repeatedly in a hot loop. - Response handling: aiohttp reads the payload asynchronously when requested. Ensure migrated code consumes or streams the body as intended and closes response/session resources.
Performance, reliability, and cost considerations
Do not choose on an unsupported speed ranking
The official documentation reviewed here describes features and lifecycles, not a controlled comparative performance test. It cannot establish that aiohttp is always faster than Requests, or that HTTPX is fastest for a given workload. If throughput or latency determines the choice, benchmark equivalent application code against the same endpoint, response sizes, concurrency, timeout policy, and connection-reuse setup.
Keep networking behavior explicit
Connection reuse and intentional timeouts improve the predictability of repeated work. Also test failure paths: slow responses, connection failures, non-success status codes, redirects, and incomplete or large bodies. Set TLS, proxy, and streaming behavior deliberately for the installed version. These are application reliability decisions, not automatic advantages of one library.
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The sources compared here do not establish comparative library prices or a performance-per-dollar result. Evaluate dependency and operational cost in the context of your existing Python stack, and avoid using a library choice as a substitute for measuring the application behavior that matters.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshooting common surprises
HTTPX raises a timeout exception earlier than expected
HTTPX’s documented default is five seconds of network inactivity, with connect, read, write, and pool timeout categories. Identify which phase is timing out and set explicit values suited to the operation. Do not assume that this default is a five-second total wall-clock cap.
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Requests appears to wait indefinitely
Requests has no timeout by default. Pass a timeout explicitly, and handle the resulting timeout exception according to whether the operation can be retried or should fail to the caller.
aiohttp does not return the body when headers arrive
Obtaining the response is not the same as reading its payload. Await response.text() or the appropriate body-reading operation inside the response lifecycle. For large responses, choose a streaming approach appropriate to the application instead of assuming the body has already been consumed.
HTTPX follows no redirect
That is its documented default. Configure redirect handling when needed and test the final response behavior. Do not assume aiohttp and HTTPX share defaults.
HTTPX reports HTTP/1.1 despite http2=True
HTTP/2 is opt-in and the server also has to support it. Check response.http_version; the configuration flag does not guarantee protocol negotiation on every request.
Repeated requests do not benefit from pooling
Check whether the code creates a new client or session for every call. Keep a reusable requests.Session, HTTPX client, or aiohttp ClientSession for related repeated requests, and close it when its owning work is finished.
Migration changes proxy routing
HTTPX uses mounts for transport routing in the cited compatibility guidance, while Requests uses a proxies convention. Review the current documentation for your installed version and test the actual route rather than assuming configuration options map one-to-one.
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When you need a website screenshot instead of an HTTP client
Requests, HTTPX, and aiohttp fetch HTTP responses; they are not substitutes for a service that renders a page in a browser and captures a screenshot. If that is the actual task, ScreenshotNeo is an alternative to try first: it returns screenshots or PDFs through a screenshot API and also provides an MCP server for AI agents. It removes known consent banners, newsletter popups, and chat widgets before capture, and bot checks, blank pages, failed loads, and cache hits are not billed.
Or skip the browser setup:
import requests
r = requests.get("https://api.screenshotneo.com/v1/shot", params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"}, timeout=90)
open("shot.webp", "wb").write(r.content)See the ScreenshotNeo documentation for request options. The same endpoint accepts a single GET request with a URL and can return PNG, JPEG, WebP, or PDF. Its response includes X-Page-Verdict and X-Billed headers to identify outcomes. Other available options include full-page capture with lazy images loaded, CSS-selector element capture, device and viewport selection, PDF page and paper settings, custom CSS or JavaScript, waiting for a selector or network idle, request blocking, custom headers and cookies, caching, signed image links, async jobs with signed webhooks, bulk capture of up to 100 URLs per call, and a usage API. Its MCP tools are take_screenshot, get_page_info, and capture_pdf.
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Frequently Asked Questions
Does HTTPX work with Trio as well as asyncio?
Yes. HTTPX documents support for both asyncio and Trio.
Does setting HTTP/2 in HTTPX mean every request uses HTTP/2?
No. The server must support HTTP/2, and the response’s `http_version` indicates the protocol actually used.
Which library should I pick if raw speed is my only concern?
The cited official documentation does not establish a universal speed winner. Compare equivalent application workloads if measured latency or throughput will decide the choice.
Quick Recap
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