The Tool Desk
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Start by identifying the layer that failed
The fastest way to diagnose Puppeteer-Sharp output is to classify the signal before deciding whether to retry, alert, or fix application code.
| Signal | Layer and trigger | Record | Typical response |
|---|---|---|---|
GoToAsync exception |
Navigation operation; the main resource could not be loaded or navigation timed out | Exception type and message, target URL, timeout and navigation options | Validate the URL, connectivity and TLS; adjust timeout or retry when appropriate |
PageError |
Uncaught exception thrown by page JavaScript | Message and raw Error |
Inspect the site’s code or reproduce with the same browser context |
Console |
Console API calls, warnings and page-error-related console output | Console type and message text | Use as context, not as proof that a request or page failed |
Error |
Browser reports that the page crashed | Crash error details and page identity | Discard the page, capture diagnostics and create a fresh page |
RequestFailed |
Network request lifecycle failure, such as a timeout | Request URL and failure text | Check DNS, TLS, proxy, blocking and resource-specific retries |
Response with status 400+ |
Server returned an HTTP error response | Status code, response URL and request context | Handle as an application or upstream HTTP error; it is not equivalent to transport failure |
Handle navigation failures separately
GoToAsync either throws or returns information about the main-resource response. A thrown call can indicate an invalid URL, SSL problem, timeout, unreachable host, nonresponsive server or another failure loading the main document. A successful return does not mean every subresource loaded successfully, so keep navigation handling separate from request-event logging.
try
{
var response = await page.GoToAsync(
"https://example.com",
new NavigationOptions
{
WaitUntil = new[] { WaitUntilNavigation.Networkidle0 },
Timeout = 60_000
});
if (response is not null && response.Status >= 400)
{
logger.LogWarning("Main document returned HTTP {Status}: {Url}",
response.Status, response.Url);
}
}
catch (Exception ex)
{
logger.LogError(ex, "Navigation failed for {Url}", "https://example.com");
// Decide whether this failure is safe to retry for your workload.
}Inspect the returned response when one is available, because an HTTP error status can be delivered normally. Do not infer that a non-null response means a 2xx result.
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Catch uncaught JavaScript with PageError
PageError is the event for an uncaught exception inside page code. Its event arguments expose Message and a raw Error value. Preserve both. The raw value can be a string, another object or null when page code throws a primitive, so code that assumes a conventional .NET exception or always-present stack trace can lose the most useful evidence.
page.PageError += (_, e) =>
{
logger.LogError(
"Uncaught page exception: {Message}; raw error: {Error}",
e.Message,
e.Error);
};Log the page URL, route or job identifier alongside these fields in your application. The event tells you that page JavaScript escaped its normal handling; it does not by itself identify a failed HTTP request.
Use Console for context, not a fatal-error switch
Console reports calls such as console.log, warnings and errors. Puppeteer-Sharp also emits console messages associated with page errors or warnings. Consequently, a console event is evidence worth recording but is not automatically a failure requiring a retry. Filter or route messages by their console type and retain the text for troubleshooting.
page.Console += (_, e) =>
{
logger.LogInformation("Browser console: {Message}", e.Message.Text);
};For production telemetry, consider separate log levels for ordinary information, warnings and error-level console entries. Keep PageError as the authoritative signal for an uncaught exception.
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Distinguish a crashed page from page code errors
The page Error event indicates that the browser page itself crashed. This is different from a JavaScript exception reported by PageError. A crash can leave the page unusable even when no application exception was emitted, so treat it as a lifecycle event: record the error, stop using that page, and create a replacement before continuing.
page.Error += (_, e) =>
{
logger.LogError(e.Error, "Page crashed");
};When a crash occurs during a capture or scrape, mark the operation as incomplete rather than treating a partially produced artifact as valid.
Understand RequestFailed and why it misses 404
RequestFailed is for a request that fails in the network lifecycle, such as a timeout. The request exposes failure text that can distinguish transport-level causes. Redirects are also important: one request finishes and another request is issued, so log each URL rather than assuming one navigation equals one request.
page.RequestFailed += (_, e) =>
{
logger.LogWarning(
"Request failed: {Url}; {Failure}",
e.Request.Url,
e.Request.FailureText);
};An HTTP 404 or 503 is still a completed HTTP exchange. Upstream Puppeteer documents that such responses finish with the request lifecycle’s completed event rather than requestfailed. To detect them, inspect response status codes.
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page.Response += (_, e) =>
{
if (e.Response.Status >= 400)
{
logger.LogWarning(
"HTTP error response: {Status} {Url}",
e.Response.Status,
e.Response.Url);
}
};Use both handlers: a DNS failure, connection reset or timeout can produce RequestFailed without a response, while an application-generated 404 produces a response and no request-failure event.
A complete diagnostic wiring pattern
The following combines the signals into one page-level setup. It is an illustrative pattern; event-argument members and logging overloads can vary by Puppeteer-Sharp package version, so verify them against the API package installed by your project.
page.Console += (_, e) =>
logger.LogInformation("Browser console: {Message}", e.Message.Text);
page.PageError += (_, e) =>
logger.LogError("Uncaught page exception: {Message}; raw error: {Error}",
e.Message, e.Error);
page.Error += (_, e) =>
logger.LogError(e.Error, "Page crashed");
page.RequestFailed += (_, e) =>
logger.LogWarning("Request failed: {Url}; {Failure}",
e.Request.Url, e.Request.FailureText);
page.Response += (_, e) =>
{
if (e.Response.Status >= 400)
logger.LogWarning("HTTP error response: {Status} {Url}",
e.Response.Status, e.Response.Url);
};Register handlers before navigation so early console, request and page-error events are not missed. Include a correlation ID in every log record when several pages or jobs run concurrently.
Diagnose common symptoms
“Navigation timed out”
- Check whether the main URL is reachable outside the browser and whether DNS, proxy or TLS negotiation is failing.
- Confirm that the selected
WaitUntilcondition matches the site. Pages that keep long-lived connections may never become network-idle. - Capture the thrown exception and the URL; do not expect
RequestFailedto explain every navigation timeout.
“The page shows an error, but no RequestFailed event fired”
- Inspect
Responsestatus values. The server may have returned a normal 404, 401, 403 or 503 response. - Inspect
PageErrorandConsoleif the page rendered an application-level error after a successful HTTP response.
“A console error appears on every run”
- Determine the console message type and text before treating it as fatal.
- Check whether the same message is accompanied by
PageError, a failed request or an HTTP error response.
“The raw page error is null or not an exception”
Keep the raw value as an object and serialize it defensively. JavaScript permits throwing primitives and arbitrary objects; only the documented message is guaranteed to be the human-readable part.
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“The page crashed”
Stop issuing operations to that page, log the crash, close or discard the page according to your lifecycle design, and retry with a new page only when the operation is idempotent. Reusing a crashed page can turn one failure into a sequence of misleading errors.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Version and maintenance considerations
Puppeteer-Sharp is a .NET port of the official Node.js Puppeteer API. Package variants, browser revisions and event-argument details can differ between releases. Pin the package version used by the application, consult its matching API documentation, and compile a small diagnostic harness after upgrades. In particular, verify the exact members for response status, console text, request failure text and page-error arguments rather than copying a pattern unchanged across versions.
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Frequently Asked Questions
Should I retry every Puppeteer-Sharp error?
No. Retry only idempotent operations and classify the signal first: transient navigation or transport failures may be retryable, while deterministic JavaScript exceptions, HTTP 404 responses and page crashes require different handling.
Where should I attach diagnostic event handlers?
Attach them immediately after creating the page and before calling navigation, so early console, response and request events are captured.
Can a successful navigation still contain broken assets?
Yes. Navigation concerns the main resource. Subresource failures and HTTP error responses must be observed through request and response events.
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