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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchStart with the response, not the status number. Record the HTTP status, provider error code, message, request ID, headers and a redacted copy of the request. Then verify the endpoint contract, credentials, permissions, resource visibility, account limits and service health in that order. A 429 may be throttling—or exhausted credits—while a 404 can hide a resource you are not allowed to see. The provider’s response body and documentation determine the safe fix.
A fast API-error triage sequence
- Capture the failure. Save the HTTP method, complete endpoint and API version, time zone-aware timestamp, status, response body, relevant non-secret headers, request or correlation ID, and the exact input shape. Redact API keys, cookies, authorization headers and personal or confidential data before sharing logs.
- Compare the request with the endpoint contract. Check the method, path and query parameters, content type, required headers, JSON syntax and nesting, field names, data types and required values. Documentation for one endpoint or API version does not prove that the same request is valid elsewhere.
- Verify identity and access. Make sure the credential is present, active, unexpired, associated with the intended project or organization and granted the required scope or role. Test access to the specific resource, not merely authentication to the service.
- Classify limits before retrying. Read the body and headers for rate limits, quota, credits and spending controls. A retry cannot restore an exhausted allowance. For temporary throttling, obey
Retry-Afterwhen supplied; otherwise reduce request frequency and use bounded exponential backoff with jitter. - Treat server errors as conditional. Check the provider’s status information and error detail. Retry only when the operation is safe to repeat and the API’s idempotency guidance permits it—especially for creates, payments or other mutations.
- Reduce to a minimal request. Reproduce the call with a carefully redacted command-line request or small client. If it fails there too, focus on the contract, access, limits or service. If it succeeds, inspect application serialization, environment variables, proxies, firewalls, TLS and retry behavior.
- Escalate with evidence. Provide the exact error code and text, request ID, occurrence time and time zone, applicable limit, sanitized request details and steps already tried. Never include API keys or authentication secrets.
What each HTTP status usually means
Status codes are clues, not universal diagnoses. Providers attach different meanings to the same code, so always read the structured error code and message as well.
| Status | Likely direction | First checks |
|---|---|---|
| 400 Bad Request | Malformed or invalid input | Method, endpoint and version, required parameters, content type, JSON syntax, body shape and field types. Invalid JSON is a documented cause in some REST APIs. |
| 401 Unauthorized | Authentication failure | Credential presence, spelling, expiry or revocation, authorization scheme, intended account, project and environment. |
| 403 Forbidden | Access or policy refusal | Scope or role, organization policy, IP restrictions and provider-specific rate-limit behavior. |
| 404 Not Found | Wrong path or unavailable resource | Identifier, API version and route. Some services deliberately return 404 for a real private resource when your identity cannot access it. |
| 429 Too Many Requests | Throttling or an account limit | Error body and code, Retry-After, rate-limit headers, project or organization quota, credits and spending limits. |
| 500/503 | Provider failure or overload | Status information, returned detail, transient condition and whether the operation is safe and idempotent to retry. |
How to fix 400 Bad Request errors
Validate the request shape
Confirm that the URL uses the documented path and API version, the method matches the operation, and every required query or path parameter is present. Check spelling and capitalization of field names, nesting, arrays and scalar types. A number represented as a string, an unexpected null, or a missing object can invalidate an otherwise plausible request.
Check encoding and headers
Send the content type required by the endpoint, commonly application/json for a JSON body. Ensure the body is valid JSON: double-quoted keys and strings, no trailing commas, and correct escaping. Compare the serialized request captured by your client with a known-good example. Do not assume a body accepted by one endpoint is accepted by another.
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Use the provider’s error fields
Many APIs return a machine-readable code, a human message and field-level details. Log those fields and correct the named field rather than repeatedly changing unrelated parameters. If the body is empty, inspect non-secret headers and verify that a proxy or gateway did not replace the provider response.
How to fix 401 and 403 errors
401: prove who the caller is
- Confirm the authorization header is actually sent in the failing environment and uses the required scheme, such as
Bearer. - Check for expired, revoked or mistyped credentials and accidental use of a test key against a production endpoint (or the reverse).
- Verify the key belongs to the intended project, organization or account.
- Inspect environment-variable loading and secret injection in containers, CI and serverless deployments.
403: prove what the caller may do
A valid identity can still lack a scope, role or resource grant. Check endpoint-specific permissions, organization policy, IP allowlists and regional or account restrictions. Some providers also use 403 for policy blocks or certain limit conditions; the provider’s error code is decisive.
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How to investigate 404 errors without deleting the resource
First verify the route, API version, host and identifier—including case, URL encoding and tenant or project prefix. Then test the same identifier with an identity that is known to have access, using a safe read operation. A 404 does not always mean “does not exist”; hiding inaccessible private resources prevents information disclosure. Do not create a replacement object until you have ruled out an access-masked 404.
How to handle 429 rate limits, quotas and credits
Identify the limit
Read the response body and headers to distinguish requests-per-second throttling from a daily quota, exhausted prepaid credits, token limits or a spending cap. Limits may apply per credential, application, project or organization. Account settings and the provider’s current documentation establish the scope.
Retry temporary throttling safely
When Retry-After is present and valid, wait at least that long. If it is absent, use exponential backoff with jitter—for example, a base delay that doubles each attempt, randomize the delay, cap both attempts and total elapsed time, and stop after a small number of tries. Do not run an application retry loop on top of an SDK loop without accounting for the combined traffic. If the response indicates exhausted credits or spending limits, stop retrying and resolve the account limit.
Example bounded retry in Python
import random
import time
import requests
url = "https://api.example.com/v1/items"
for attempt in range(5):
response = requests.get(url, timeout=30)
if response.status_code != 429:
response.raise_for_status()
data = response.json()
break
retry_after = response.headers.get("Retry-After")
if retry_after and retry_after.isdigit():
delay = float(retry_after)
else:
delay = min(30.0, 0.5 * (2 ** attempt)) + random.uniform(0, 0.25)
time.sleep(delay)
else:
raise RuntimeError("Rate limit persisted after bounded retries")Adapt the code to the provider’s units and retry guidance. For writes, use an idempotency key or the provider’s documented deduplication mechanism where available.
How to handle 500 and 503 responses
A 5xx response can be transient, but it is not automatically harmless. Check the provider’s incident or status information, preserve the request ID, and inspect the body for a specific condition. A delayed retry may help with overload; an immediate retry storm can worsen it. Never blindly repeat a non-idempotent operation. If the provider documents idempotency keys, send the same key for each retry and reconcile the final state before attempting another create.
Separate application bugs from network and service failures
- Build a minimal request with the same endpoint, method, essential headers and sanitized payload.
- Run it from the same host or deployment environment to expose proxy, firewall, DNS and TLS differences.
- Compare the raw request and response with your application’s logged serialization.
- Test a second environment only after protecting credentials; a success elsewhere points toward network policy, configuration or environment variables.
- Inspect client timeouts and connection pooling. A client-side timeout is not the same as an HTTP 504, and a proxy-generated error may not contain the provider’s request ID.
Build useful error logs and escalation tickets
Store structured fields for status, provider error code, message, method, host, path, API version, request ID, timestamp with time zone, latency, retry count and a redacted request fingerprint. Keep the original response body where policy allows. Do not log authorization headers, API keys, cookies or sensitive payload values. When contacting support, include the sanitized request, exact error, request ID, time, applicable quota or limit and the troubleshooting steps already completed.
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Use the documented options at ScreenshotNeo’s API documentation to set waits, selectors, headers, cookies, user agents, blocking rules, viewport and device presets, dark mode, full-page lazy-image loading, PDFs, custom JavaScript or CSS, element capture, caching, signed links, asynchronous webhooks and bulk jobs.
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpimport requests
r = requests.get("https://api.screenshotneo.com/v1/shot", params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"}, timeout=90)
open("shot.webp", "wb").write(r.content)const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' }); const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);Its MCP server provides take_screenshot, get_page_info and capture_pdf tools for Claude, Cursor and other MCP clients. The Free plan includes 1,000 shots per month with no card; paid plans start at $5 for 3,000 shots, and every feature is on every plan. Sign up free to investigate rendered API error pages without setting up a browser.
FAQ
Should I retry every failed API request?
No. Retry only documented transient conditions, honor provider delays, cap attempts and verify that repeating the operation is safe.
Why does the same problem return 401 for one API and 403 for another?
Status semantics are provider-specific. Compare the response body, error code and authentication or authorization documentation for that API.
What should I send support first?
Send the exact error, provider code, request ID, timestamp and time zone, sanitized request details, applicable limit and steps tried—never secrets.
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