The Tool Desk
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What a mixed content warning means
HTTPS protects the document request, not automatically every request made by that document. If an HTTPS page loads an image, stylesheet, script, iframe, API endpoint, form action, download, or WebSocket over HTTP, the page combines secure and insecure transport.
The security problem is integrity as well as confidentiality. Someone able to alter an HTTP response in transit could replace a JavaScript file, change a stylesheet, substitute an image, or modify another response. A changed script can execute code in the page’s security context; a changed image can mislead visitors.
Browsers generally divide mixed content into upgradable and blockable requests. Upgradable requests may be rewritten from http:// to https://. Blockable active content is refused because allowing modification would undermine the page. Exact console wording and behavior vary by browser release, so treat the developer console for the affected page as authoritative.
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Passive versus active mixed content
| Category | Typical resources | Likely browser response | Risk |
|---|---|---|---|
| Passive or upgradable | Images and some media | Automatic HTTPS upgrade when an HTTPS equivalent is available; otherwise the request can fail | Content can be altered or unavailable |
| Active or blockable | Scripts, stylesheets, frames, and many programmatic requests | Blocked rather than silently allowed | Page behavior or code could be changed |
An image that appears to work is not proof that the source is correct: the browser may have upgraded it, or a cache may have hidden the problem. Every request should have a secure URL that your server can deliver reliably.
Common causes after enabling SSL
Hard-coded URLs
Templates, CMS fields, feeds, downloads, and old database content often retain http://example.com/... after the main site moves to HTTPS. Search generated HTML as well as source files.
CSS and JavaScript references
Mixed content can be hidden in CSS url() declarations, JavaScript strings, dynamically constructed fetch or XHR calls, and libraries loaded by another script. A page may look clean in its HTML while a runtime request still uses HTTP.
Third-party embeds and CDNs
Advertising, analytics, video players, fonts, widgets, and payment or map integrations can point to an HTTP endpoint. Use the provider’s HTTPS endpoint. If no secure endpoint exists, replace the integration rather than weakening the page.
Forms, frames, downloads, and network endpoints
Check form action attributes, iframe sources, download links, API URLs, WebSocket endpoints, and redirects. A secure-looking URL that redirects to HTTP still creates an insecure request path.
Diagnose the exact request
- Open the affected HTTPS page.
- Open Developer Tools (usually F12 or Ctrl+Shift+I) and select the Console tab.
- Reload the page with the console open. Read the complete mixed-content entry, including the requesting page, resource type, and URL.
- Use the Network tab to confirm whether the request was upgraded, blocked, redirected, or failed certificate validation. Filter for “mixed” or inspect requests whose URL begins with
http://. - Repeat the check in relevant browsers after clearing the cache or using a private window. Browser behavior and wording can differ by release.
One page load is not a site-wide audit. Use a recursive crawler or mixed-content checker to find references in less frequently visited pages, CSS, feeds, archived templates, and generated documents.
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Fix mixed content step by step
1. Make the origin genuinely available over HTTPS
Install a valid certificate for the hostname, serve the resource on HTTPS, and verify the complete certificate chain. Test the exact path, not only the home page. Confirm that redirects remain HTTPS from the original URL through the final response.
2. Replace first-party HTTP URLs
Change same-site references to https://. A safe relative URL such as /assets/app.js also inherits the page’s scheme. Update HTML, CSS, JavaScript, CMS fields, templates, feeds, forms, iframe URLs, download links, API settings, and WebSocket configuration. Do not rely on protocol-relative URLs such as //cdn.example.com/file.js as a long-term fix; an explicit HTTPS endpoint is clearer.
3. Repair or replace third-party resources
Check the provider’s documentation for its HTTPS hostname and use that endpoint. If the service supports HTTPS only on a different host, update the integration and its allowed-origin or callback settings. If it cannot serve securely, remove or replace it.
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4. Re-test every path
Reload affected pages, test logged-in and logged-out states, exercise JavaScript interactions, submit forms in a safe test environment, and inspect downloads and embedded frames. Crawl the site again after deployment. A URL that works when pasted into a browser is insufficient: the request context, redirect chain, certificate, and resource type all matter.
Using Content Security Policy safely
upgrade-insecure-requests
The Content-Security-Policy: upgrade-insecure-requests directive tells the browser to rewrite eligible insecure resource requests to HTTPS before making them. It also covers same-origin top-level navigations, nested browsing-context navigations, and form submissions. It does not upgrade a top-level navigation to a different origin.
Send it as an HTTP response header, for example:
Content-Security-Policy: upgrade-insecure-requestsUse this as a migration safety net while you correct source URLs. It cannot create an HTTPS service where none exists, repair a broken certificate, or make an HTTP-only third party secure.
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HTTP Strict Transport Security (HSTS) tells browsers to use HTTPS for future requests to your host. HSTS is still needed to protect visitors who follow third-party links and to reduce SSL-stripping exposure. CSP rewriting applies when the browser has already loaded the page containing the policy; HSTS addresses the initial navigation after the policy is stored.
Do not add deprecated blocking directives
block-all-mixed-content is deprecated. Modern browsers already upgrade upgradable content and block other mixed content, so new projects should not depend on this directive.
Troubleshooting: symptom, cause, and fix
| Symptom | Probable cause | Fix |
|---|---|---|
| Script or stylesheet is blocked | Active resource still uses HTTP, or its HTTPS URL fails | Change the source to HTTPS, test the exact URL and certificate, then inspect redirects. |
| Image disappears after SSL migration | Browser upgraded it but no working HTTPS equivalent exists | Serve the image at HTTPS and update stored references. |
| No warning in page source, but console reports mixed content | CSS, JavaScript, an iframe, or a runtime API call generated the request | Use Network logging and search scripts, stylesheets, and CMS data. |
| Third-party widget fails only on HTTPS | Provider exposes HTTP only or redirects to HTTP | Use its documented HTTPS endpoint or replace the widget. |
| Form submission is blocked or downgraded | Form action is HTTP | Use an HTTPS action on the same service and verify the complete redirect chain. |
| It works after adding CSP but returns later | Source references were never corrected, or HTTPS is unavailable | Keep CSP during migration, fix the underlying URLs, and crawl after each release. |
| Only some users see the warning | Different browser versions, cached policies, login states, or page variants | Test representative browsers and states; compare their console and Network output. |
Performance, reliability, and deployment checks
- Prefer one stable HTTPS origin and avoid unnecessary redirect hops.
- Check certificate expiry, intermediate certificates, supported hostnames, and renewal automation.
- Review cache keys and CDN rules so HTTPS responses are not replaced by HTTP redirects or stale objects.
- Test lazy-loaded images, infinite scroll, client-side navigation, service workers, and authenticated pages; these can issue requests after the initial load.
- Run a recursive crawl in CI or before releases, and fail the build when production URLs contain unexpected
http://references. - Keep third-party dependencies current and document each external hostname so an endpoint change is noticed.
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Can mixed content exist if the padlock is shown?
Yes. The padlock describes the document connection; subresources can still be upgraded, blocked, or requested insecurely.
Will changing every URL to HTTPS always fix the warning?
No. The HTTPS resource must exist, have a valid certificate, and remain HTTPS through redirects. Runtime-generated requests and third-party resources also need checking.
Should I use HSTS before every legacy URL is fixed?
Deploy HSTS deliberately after confirming HTTPS coverage for the host and its important subdomains. It enforces HTTPS; it does not repair unavailable resources.
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