First identify which HTTPS connection failed: your client connecting to the screenshot API, or the API’s browser connecting to the page you want captured. The fixes are different. Check the API status, response body and headers, plus any render logs, before changing certificate settings or treating a response as an image.
Identify which TLS connection failed
A screenshot request can involve two separate HTTPS connections. Your application first connects to the screenshot API. After accepting the request, the API’s rendering browser connects to the target website. An error in either connection can look like an SSL problem, but only the first prevents a normal API response.
| Failure point | Typical evidence | What to investigate |
|---|---|---|
| Client to screenshot API | The client reports a TLS or certificate error before receiving a normal API response. | Your runtime’s trust store or CA bundle, proxy, system clock, and the API endpoint’s certificate. |
| Renderer to target page | The API accepts the request, but rendering or navigation fails, or the returned result reflects a target-page error. | The target certificate, the renderer’s trust of its chain, provider render logs, and any target-page status information. |
Providers expose different diagnostics. For example, screenshot API documentation may describe a final target-page status header, while another provider may return image bytes on success and JSON errors on failure. Check the relevant provider’s documentation and logs rather than assuming every service reports failures the same way. Screenshot API documentation describes target-page status; ScreenshotEngine documentation advises checking the HTTP status before treating the body as an image.
Collect evidence before changing settings
- Save the exact error. Record the complete message, API HTTP status, response headers and body content type. Note the runtime and browser versions, and whether the same URL opens in an ordinary browser. Redact credentials, tokens and sensitive URL parameters.
- Determine whether the API returned a response. A client-side TLS failure generally occurs before a normal API response. If the API returned a status and body, inspect those and the provider’s render diagnostics to see whether the problem occurred during target-page navigation.
- Check the target hostname and certificate. Confirm that the hostname in the requested URL matches a name on the certificate, that the certificate is within its validity dates, and that the server presents a chain the rendering browser trusts.
- Retest with verification enabled. Make a controlled request after fixing the relevant trust or certificate issue. Keep certificate validation enabled; bypassing it can expose the connection to an impostor or an intercepted endpoint.
Fix a client-to-API certificate error
Check the caller’s trust configuration
If your client cannot establish HTTPS to the API endpoint, verify that the machine clock is correct and that the runtime has an up-to-date CA bundle or system trust store. Confirm that your application is using the expected trust configuration, especially if it runs in a container or on a managed host.
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Check proxies and TLS inspection
A corporate proxy may intercept HTTPS and present a certificate signed by an organization-specific root CA. If the caller does not trust that root, certificate validation can fail even though the API endpoint’s public certificate is valid. Ask your network administrator whether TLS inspection is enabled, then configure the appropriate organization-approved CA in the client environment. Do not disable verification to get around an untrusted proxy certificate.
For one specific case—installing Playwright browsers in a Node environment behind a proxy that intercepts requests with an untrusted custom CA—Playwright documents setting NODE_EXTRA_CA_CERTS before browser installation. That remedy applies to the documented browser-download scenario; it is not a universal setting for every screenshot API or hosted renderer. See Playwright’s proxy and firewall guidance.
Fix a renderer-to-target certificate error
Validate the target’s certificate and chain
If the API accepted your request but its browser reports a certificate error while opening the target, check the website’s certificate identity, validity period and presented chain. Chrome lists NET::ERR_CERT_AUTHORITY_INVALID and ERR_CERT_COMMON_NAME_INVALID among certificate-related errors. Those messages point toward trust or hostname identity problems, but they do not by themselves establish which configuration is wrong. See Chrome Help on connection errors.
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Account for the renderer’s location and trust store
Your desktop browser and a hosted screenshot service may run on different machines and networks. A target that opens on your laptop may still fail in a remote renderer if it presents an incomplete chain, relies on a private CA, or is reached through different network infrastructure. Use the provider’s render logs or target-status diagnostics, if available, and ask the provider whether its renderer can trust the relevant CA. Exact diagnostics and configuration options vary by service.
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Some internal websites require mutual TLS (mTLS): the client must present its own certificate as well as validate the website’s server certificate. This is separate from trusting the server’s certificate chain. First confirm that the target requests a client certificate. Then check whether your chosen screenshot service supports supplying one; do not assume that support exists.
For a local Playwright browser, client certificates can be configured for particular origins using PEM or PFX material. That is a Playwright capability and does not imply that a hosted screenshot API exposes the same option. See Playwright’s browser context documentation.
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Check local Chrome-only connection problems
If the failing browser is Chrome on your own device, first check whether a Wi-Fi captive portal needs sign-in. Chrome Help also suggests testing in Incognito and considering whether an extension is interfering. These checks may help diagnose a local browser session, but they do not necessarily apply to a remote browser operated by a screenshot API. See Chrome Help.
Common symptoms and what to do
| Symptom | Likely diagnostic direction | Next step |
|---|---|---|
self signed certificate in certificate chain during a client or browser-install operation |
An untrusted CA may have been introduced by a proxy or private certificate chain. | Identify which process emitted the error and configure the approved root CA for that environment. Playwright’s NODE_EXTRA_CA_CERTS guidance is specifically for its documented proxy browser-installation scenario. |
NET::ERR_CERT_AUTHORITY_INVALID |
The browser does not trust the authority that issued the presented certificate. | Check the target’s presented chain and whether the relevant renderer trusts its issuer. |
ERR_CERT_COMMON_NAME_INVALID |
The requested hostname may not match the certificate identity. | Verify the hostname in the URL and the names covered by the certificate. |
| A non-image body or an invalid image file | The API may have returned a JSON error or other non-image response. | Inspect HTTP status and content type before saving or decoding the body as an image. |
| Target loads on your computer but not in the screenshot | The remote renderer may have a different trust store, network path or access to the target. | Inspect provider render logs and target-status details; ask the provider about renderer trust configuration if needed. |
Handle API responses safely in your client
Do not assume every successful transport produces image bytes. Check the HTTP status and content type, and retain the error body for diagnosis. The following generic pattern illustrates the checks; adapt the expected status and media types to the API you use.
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if not response.ok:
raise RuntimeError(
f"Screenshot API returned {response.status_code}: "
f"{response.headers.get('content-type')} {response.text}"
)
content_type = response.headers.get("content-type", "")
if not content_type.startswith(("image/", "application/pdf")):
raise RuntimeError(f"Unexpected screenshot response type: {content_type}")
save_bytes(response.content)This prevents a JSON error response from being mistaken for a corrupt screenshot. It does not diagnose or repair TLS by itself; use the connection boundary and error details to locate the certificate failure.
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Why not ignore certificate errors?
Flags such as --ignore-certificate-errors bypass validation rather than correcting the certificate, trust store or proxy configuration. That can make the browser accept an impostor or a TLS connection intercepted by an untrusted party. Treat such bypasses as unsafe, not as a durable fix. Restore verification and repair the underlying trust or target-certificate issue.
Or skip the browser setup
ScreenshotNeo is a screenshot API and MCP server for developers. It accepts cookie and consent banners before capture and removes more than 60 known consent platforms, newsletter popups and chat widgets; each cleanup step can be turned off. Bot checks and CAPTCHAs, blank pages, timeouts, failed loads and cache hits are not billed, and responses report page verdict and billing status in headers. Its MCP server offers screenshot, page-info and PDF tools for AI agents. These features do not guarantee that every certificate error can be corrected; first identify which connection is failing.
One GET request can return an image or PDF. See the ScreenshotNeo API documentation for request options 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.webpThat request uses ScreenshotNeo’s API endpoint. Its free plan includes 1,000 shots per month with no card; paid plans start at $5 for 3,000 shots. Sign up for free ScreenshotNeo access.
Frequently Asked Questions
Does an SSL error mean the screenshot API itself is broken?
Not necessarily. The TLS failure may be between your client and the API, or between the API’s renderer and the target website. The API status and render diagnostics help distinguish them.
Can a target site’s certificate be valid in my browser but fail in a screenshot?
Yes. A hosted renderer can use a different network path and trust store from your device. Check provider-specific render output and target-status diagnostics.
Is a certificate error the same as an API authentication error?
No. A TLS certificate error occurs while validating a connection. An HTTP authentication response is returned after an HTTP connection is established; inspect the status and body rather than treating every failed request as a certificate problem.
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