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A 403 means a server understood the request and refused it; the status alone does not tell you whether ShrinkTheWeb, an image origin, a CDN, or another security layer refused it. Start by inspecting the response body and headers, then use that evidence and relevant logs to locate the rule. No ShrinkTheWeb-specific cause or fix is established here, so treat the checks below as general HTTP and CDN troubleshooting—not confirmed ShrinkTheWeb requirements.
What a 403 tells you—and what it does not
HTTP 403 Forbidden indicates that the responding server refused the request. It does not identify the responsible system or explain the reason. Possible sources include origin permissions, IP-deny rules, firewalls, web application firewall (WAF) rules, or CDN security features. Cloudflare describes these as possible sources of 403 responses: Cloudflare’s 403 troubleshooting guidance.
A 403 is not proof that your image URL is malformed, that your ShrinkTheWeb account is blocked, or that a particular parameter is missing. The current ShrinkTheWeb API requirements and service-side error conditions are not established by the available vendor-specific guidance. Avoid changing credentials or request formats based on guesswork.
Diagnose the request in order
- Capture the evidence. Record the exact request URL, status code, response body, and response headers. Keep any sensitive key or token private if you share the details.
- Identify the likely responder. Look for a branded CDN or security-provider error in the response body and headers. A branded response can point to that provider, while an unbranded one may come from the origin; neither is conclusive by itself.
- Check the exact image URL and request. Confirm that the URL is correct and reachable as intended, and that any parameters required by your integration are present and current. These are general checks; ShrinkTheWeb’s current parameter and authentication requirements have not been verified.
- Review access controls. If you administer the relevant origin or security layer, check origin permissions, IP-deny rules, firewall rules, and WAF events for a block matching the request.
- Check hotlink protection if the URL is hosted on an image site. Compare the request’s
Refererheader with that host’s policy. Cloudflare documents hotlink protection that denies a request when the Referer does not include the site’s domain and is not blank: Cloudflare hotlink protection. If you control the host, adjust its policy only for requests that should be allowed. - Correlate logs or compare paths where possible. Check the CDN, WAF, and origin logs at the time of the failing request. If you control a custom origin and can test it directly, compare that response with the CDN response; this can help isolate the layer, but a direct-origin comparison is not available in every setup. AWS provides guidance on investigating CloudFront 403 responses through WAF and origin logs: CloudFront 403 troubleshooting.
How to interpret common clues
| Clue | What it may indicate | Next check |
|---|---|---|
| Branded CDN or security error | The CDN or security provider may have refused the request; branding alone does not prove the cause. | Match the request time and details to provider security logs and rules. |
| Origin-specific message or log entry | An origin permission or access rule may be responsible. | Review origin permissions and the matching request in origin logs. |
| Image works in one context but not another | A hotlink rule or another request-context-dependent policy may be involved. | Compare the Referer and relevant access rules for both requests. |
| Only the status code is available | There is not enough evidence to identify the refusing layer. | Collect the response body and headers, then consult logs for the relevant systems. |
When to contact ShrinkTheWeb
If the response evidence and logs do not identify the refusing layer, ask ShrinkTheWeb support to confirm the current request format, authentication requirements, account limits, and any service-side rejection reason. Include the request time, exact URL format with secrets removed, status, response body, and headers. The available information does not establish a current ShrinkTheWeb-specific 403 cause or a vendor-confirmed fix.
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One GET request returns a screenshot. See the ScreenshotNeo API documentation for request options and response details.
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