Outdated Drivers Are Slowing You Down
One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchWindows Errors? Fix Them Before They Spread
Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallCaching can happen in two different places when you use a web scraping API: an HTTP cache may reuse an eligible response, and the scraping service may separately retain and reuse fetched pages or extraction results. The second behavior is specific to the service; an API’s existence does not prove it caches repeated requests. To know whether a call will fetch a fresh page, check the service’s documented cache scope, cache key, expiry rules, and refresh controls.
How does caching work in a web scraping API?
Think of caching as a saved response that may be reused instead of doing the work again. In a scraping workflow, however, “saved response” can refer to different things:
- HTTP response caching: a client, proxy, gateway, or other intermediary stores an HTTP response and may reuse it for a later equivalent request when the protocol permits.
- Application-level caching: the scraping service stores something at the product layer, such as a fetched page, extracted data, or a completed result, and may return it for a later API call.
These layers are related but not interchangeable. HTTP caching rules describe how HTTP caches handle messages; they do not, by themselves, establish whether a scraping API stores its own results, what it considers an equivalent scrape, or how long it keeps them. A service might use HTTP caching, add its own result cache, or provide no shared result cache.
RFC 9111 cautions that application caching should be apparent or controllable and encourages applications that cache data to define how they handle HTTP cache directives. That is a standards recommendation, not proof that every application cache follows every HTTP directive.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
#1 Best Overall
How does an HTTP cache decide whether a response is fresh?
An HTTP cache compares a stored response’s current age with its freshness lifetime. If the response is still fresh and the request is eligible to use it, the cache may satisfy the request without contacting the origin. This can avoid repeated network work, but it also means the caller may not get a newly fetched representation on every request.
A response’s freshness lifetime can be explicit or, in some circumstances, heuristic. Explicit freshness can be set with response directives such as Cache-Control: max-age or, for shared caches, Cache-Control: s-maxage; an Expires header can also provide an expiration time. The cache accounts for the response’s current age rather than treating the lifetime as a new countdown each time it is reused.
What happens when a cached response expires?
When a response becomes stale, a cache generally validates it before reuse where the protocol permits, rather than assuming the stored representation is current. If validation confirms that the representation remains usable, the cache can reuse the stored body; if not, it obtains an updated response. The exact result depends on the response, request, cache, and applicable directives.
What do ETag and Last-Modified mean for scraping?
ETag and Last-Modified are validators that can help a cache check whether a stored representation has changed. A cache can send a conditional request using a validator; the origin can indicate that the stored representation is still valid or return a newer one. They are not guarantees that a scraping API exposes revalidation to its caller, or that the API’s internal cache uses these validators.
What do Cache-Control and no-cache mean?
Cache-Control communicates caching directives, but the meaning depends on which directive is used and whether it appears on a request or a response. For example, max-age and s-maxage describe freshness lifetimes in the relevant cache context. A client’s request directive and an origin’s response directive should not be assumed to have identical effects in every implementation.
no-cacheis about reuse, not simply storage. It generally means a stored response must be validated before reuse; it does not mean “never store this response.”no-storeis about storage. It directs caches not to store the request or response as specified by the protocol. It is not a synonym for requiring validation of an otherwise stored response.
Do not assume that adding a directive to your request will force a scraping service’s application cache to refresh. The service may not expose HTTP cache directives to its internal cache, or it may document only a subset of their behavior. Check the service’s own API documentation for the supported control and its exact semantics.
How does a scraping API decide that two calls are equivalent?
For a generic HTTP cache, the primary cache key includes the request method and target URI. Response Vary behavior can affect which stored response is suitable for a later request, because request headers named by Vary can distinguish representations.
An application-level cache may define equivalence differently. As a design possibility—not a claim about any particular provider—it could take account of request parameters or rendering configuration in addition to the target URL. For a scraper, details such as output format, selected fields, headers, cookies, or browser settings may matter to the result. The provider’s documentation must say which dimensions actually form its key; do not infer them from the HTTP URL alone.
This matters especially for personalized pages. Two requests for the same URL can produce different content for different users or sessions. If a cache does not correctly account for the relevant variation, a reused response may be inappropriate. Look for explicit documentation about Vary, authentication or session-specific responses, and whether user-specific data can be retained.
Does a scraping API cache my requests?
You cannot tell from the fact that a service is a scraping API. A product may cache fetched pages, extracted results, neither, or use a cache only in specific modes. A general HTTP cache somewhere along the request path is also different from a result cache that the API itself controls.
The cited Zyte reference documents an HTTP API for web data extraction and a single-URL endpoint that waits until the result is ready. It does not specify a cache key, cache lifetime, bypass control, or reuse of identical scrape requests. ScrapingBee’s cited documentation describes its scraping API and proxy mode, but does not establish whether repeated calls are cached, how equivalence is defined, how long a result lasts, or whether a bypass option exists. Those omissions are not evidence that either service does or does not cache; they mean the cited pages do not establish the behavior.
For a specific provider, seek current, explicit documentation or ask the provider. Avoid relying on an undocumented assumption when freshness, privacy, or billing depends on whether a call reaches the target site.
How to evaluate a scraping API’s cache behavior
Before relying on a provider’s caching behavior, find answers to these questions in its current documentation or contract:
- Scope: Does it cache HTTP responses, fetched pages, extracted output, or completed jobs? Is the cache shared, per account, or per request context?
- Key: Which request properties make two calls equivalent? Does the key include query parameters, headers, cookies, authentication, rendering options, or output format?
- Freshness: Is there a stated TTL? Does the provider honor origin
Cache-Control,Expires,Age,ETag, andLast-Modified, or use its own policy? - Refresh: Is there a documented bypass, forced revalidation, or invalidation option? Does it apply to the HTTP cache, application cache, or both?
- Coverage: Which directives and
Varycases are supported? How are personalized or authenticated pages handled? - Observability: Can the caller distinguish a cache hit from a fresh fetch, see an age or revalidation outcome, or inspect relevant response headers?
- Data handling: Does the provider retain sensitive or user-specific content, and for how long?
If an answer is not documented, record it as unknown rather than assuming standard HTTP behavior fills the gap. A practical question to send support is: “For this endpoint, what exact fields form the cache key, what is the retention or freshness period, which origin cache directives are honored, and how can I force a fresh fetch?”
Why implementations differ: two documented examples
Standards support does not guarantee that every implementation supports every feature. Scrapy’s version 2.0.1 documentation describes an HTTP cache that can return a previously stored response for the same request without another Internet transfer. Its documented RFC2616Policy handles directives and validators including no-store, no-cache, max-age, Expires, Last-Modified, Age, Date, ETag and Last-Modified revalidation, and request max-stale. The same documentation lists limitations, including lack of Vary support and lack of invalidation after updates or deletes. This is a version-specific illustration, not a statement about current Scrapy behavior.
Google Apigee’s response-cache documentation gives a different implementation example: its policy supports only a subset of response Cache-Control capabilities, does not support inbound client Cache-Control headers, and supports only public caches. When configured to use response cache headers, max-age can determine cache duration, subject to other settings. The point is not that one implementation is universally better; it is that supported controls are product-specific.
Quick wins for a faster PC:
Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →How to get a fresh page when cache behavior is unclear
- Identify the layer. Decide whether you are trying to bypass a browser, proxy, gateway, HTTP response cache, or the scraping API’s result cache. A control for one layer may not affect another.
- Check the endpoint documentation. Find the documented cache-bypass or revalidation parameter, if any, and confirm whether it forces a target-site fetch or only changes HTTP handling. Do not invent parameter names based on another provider’s API.
- Review the request and response. Where available, inspect cache-related headers and provider status fields. A cache hit, age, or validator outcome is useful evidence, but absence of such a field does not prove a fresh fetch.
- Test with a controlled page. If you can safely do so, request a page whose content you can change, then compare results before and after a documented refresh action. Keep request settings identical except for the refresh control, and avoid testing with sensitive or user-specific content.
- Escalate unknowns. If the provider does not document key, lifetime, and bypass behavior, ask support before designing a workflow that requires fresh data on each call.
Do not use a random query parameter as a cache-buster unless the provider documents that behavior and the target site permits it. It may change the HTTP URI without changing an application cache key, create unnecessary distinct entries, or alter how the target handles the request.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Performance, reliability, and cost implications
A cache hit can reduce repeated fetching and processing, but the benefit depends on the cache scope and whether the saved result is still suitable. A stale or wrongly keyed result can be worse than a slower fresh fetch. For time-sensitive data, set an explicit freshness requirement in your application and choose a documented refresh path rather than treating a successful API response as proof of recency.
Reliability also depends on visibility. If an API does not expose hit/miss or age information, it may be difficult to distinguish a fresh result from a reused one. For sensitive pages, confirm retention and isolation behavior before sending credentials or personal data. Avoid assuming that no-store in an HTTP exchange guarantees that a separate application layer never retains derived output.
Costs are provider-specific. A cache may reduce upstream work, but the cited provider documentation does not establish comparable caching behavior or billing effects for Zyte and ScrapingBee. Check the current pricing and usage terms for the particular endpoint, and verify whether a cache hit is billed the same way as a fresh scrape rather than estimating savings from HTTP rules.
Free tools Windows power users keep installed
One-click scans. No signup required.
Best Value
Or skip the browser setup
If your immediate task is capturing a rendered page as an image or PDF rather than extracting structured data, ScreenshotNeo is a screenshot API and MCP server for developers. That is a different job from general-purpose web data extraction, but it can avoid building and maintaining a browser capture flow yourself. One GET request returns a PNG, JPEG, WebP, or PDF. For example, the cURL call below saves a WebP screenshot; see the ScreenshotNeo API documentation for parameters and response details.
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webp
ScreenshotNeo accepts cookie or consent banners as a visitor and removes more than 60 known consent platforms, newsletter popups, and chat widgets before capture; each step can be turned off. Bot checks, blank pages, timeouts, failed loads, and cache hits cost nothing, and response headers report the page verdict and billing status. Its MCP server includes take_screenshot, get_page_info, and capture_pdf for Claude, Cursor, and other MCP clients. The Free plan includes 1,000 screenshots per month without a card; paid plans start at $5 for 3,000 screenshots.
Sign up for free: 1,000 screenshots a month with no card.
Do these 3 things before closing this tab:
1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteFrequently Asked Questions
Can I tell from a 200 response whether a scraping API used its cache?
No. A successful status alone does not reveal whether the API fetched the page or reused a result. Look for documented cache indicators such as hit/miss status or age, and treat the behavior as unknown if the service exposes none.
Should I send credentials or cookies to a scraping API that may cache results?
Only after confirming the provider’s documented retention, cache isolation, and handling of user-specific data. If those details are unavailable, ask the provider before sending sensitive material.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
