Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsWhy does our scanner arrive with a source? A URL scanner can send a Referer header that tells the destination which page the request claims to have come from. A site can use that value to serve a different page or redirect. Because the header is supplied by the client, however, it does not prove where a visitor actually came from.
What a Referer header tells a site
Despite the conventional English spelling “referrer,” the HTTP request header is spelled Referer. When a browser follows a link or requests a resource, it may send the address of the page that initiated the request. Depending on policy, that value can include the referring page’s origin, path, and query string; it does not include the fragment or user-info. MDN’s Referer reference describes the header and its contents.
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The requesting client supplies the value. A destination can use it as an input—for example, to choose a redirect or a content variant—but it is not an authenticated record of the visitor’s route. A scanner that sends a source value is reporting a request attribute, not proving that a person arrived through that source.
Why the scanner may send only an origin—or nothing
The browser’s referrer policy controls whether the header is sent and how much of the address it contains. The common strict-origin-when-cross-origin policy sends the full address on same-origin requests, only the origin on secure cross-origin requests, and no header when a secure page leads to an insecure HTTP destination. MDN’s Referrer-Policy reference explains these behaviors.
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- PORTABLE SCANNER FOR USE ON-THE-GO — The fastest and lightest mobile single-sheet-fed compact document scanner in its class¹
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no-referrersuppresses the header.originsends only the origin, such ashttps://example.com/.- Under
strict-origin-when-cross-origin, a cross-origin request may carry the origin rather than the full source URL; a secure-to-insecure downgrade gets no header.
So “the scanner has a source” does not necessarily mean it sent a complete search-results URL. It may have sent only an origin, or policy and request conditions may have omitted the header altogether.
How a referrer gate changes what the scanner sees
A site can check the incoming Referer value and branch: a request without one can receive one response, while a request carrying an accepted source can receive another. The paper “Cloak of Visibility” describes cloaking software checking referer values to determine whether visitors came from search portals. Its detection pipeline supplied a Referer to address that evasion technique. The paper also discusses other delivery differences, including redirects, server-side content changes, and crawler-only errors.
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That mechanism helps explain the related question, “Why does a scanner without a referrer see a clean page?” If the site’s logic treats a missing source differently, the request can enter a branch that does not show the content served for an accepted source. But a clean result under one request condition says only what that request received; it does not establish what every visitor or source sees.
What “cloaking” means—and what a header difference proves
Google Search Central defines cloaking as “the practice of presenting different content to users and search engines with the intent to manipulate search rankings and mislead users.” Google’s spam policies make intent part of that definition. A different result triggered by a request header alone does not establish that intent, so the difference is a reason to investigate rather than proof of a policy violation.
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- SIMPLE FILE MANAGEMENT — Scanner allows the creation of searchable PDFs with Optical Character Recognition (OCR) and convert scans to editable Word or Excel files effortlessly; Designed for home and office document scanning
How to test the source-dependent behavior
Cloudflare’s URL Scanner API documentation includes a referer parameter, along with options for a custom user agent and custom headers. This shows that a scanner can be configured to send a selected source value. It does not make the request equivalent to a browser visit: setting one header does not reproduce the browser, network, or user context. See Cloudflare’s URL Scanner API example.
To compare what a target serves, keep the URL constant and change one request condition at a time. Record the header sent, response status, redirect chain, and final rendered content for each run.
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- Scanner type: Document
- Connectivity technology: USB
- With Auto Scan Mode, the scanner automatically detects what you're scanning
- Digitize documents and images
- No referrer: send the request without a
Refererheader. - Origin-only referrer: send the source origin without its path or query string.
- Allowed source: send the source value the site is expected to accept.
Compare the outcomes across those runs. If content differs, the result establishes that the tested requests took different paths; it does not, by itself, identify why the site branches or establish intent. Other mechanisms described in the cloaking study can also affect the response, so avoid attributing every difference to the referrer alone.
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