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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallStart by checking what WordPress returned: WP_Error means the request failed before WordPress received an HTTP response; an HTTP response means you can inspect Anthropic’s status code and error details. That distinction quickly separates transport problems from Claude API errors.
1. Determine whether the failure came from WordPress or Anthropic
WordPress’s wp_remote_post() returns either a response array or a WP_Error. Check for WP_Error before calling response helpers; a returned HTTP response is not necessarily a successful Claude call.
WordPress documents its HTTP API and response inspection in Making HTTP requests. Its helpers include wp_remote_retrieve_response_code() and wp_remote_retrieve_body(). The status helper extracts a code from a valid response shape; if given a malformed argument, it can return an empty string.
- If you have a
WP_Error: record its code and message, with secrets removed. Investigate the WordPress/PHP hosting environment, DNS, outbound connectivity, TLS certificates, and any proxy or firewall between the server and Anthropic. The precise cause depends on the deployment. - If you have an HTTP response: record the status and body, then inspect Anthropic’s structured error details and request ID. Use the status map below to choose the next check.
The following illustrative pattern shows the branch; it is not a complete plugin implementation:
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$response = wp_remote_post( $endpoint, $args );
if ( is_wp_error( $response ) ) {
// Log the transport error code/message, safely redacted.
return;
}
$status = wp_remote_retrieve_response_code( $response );
$body = wp_remote_retrieve_body( $response );
$data = json_decode( $body, true );
if ( $status < 200 || $status >= 300 ) {
// Inspect the API error type/message and retain the request ID.
}2. Read the Claude error and preserve its request ID
Anthropic’s API error response includes an error type and message. The request ID may appear as request_id in the JSON error object or in the request-id response header. Save it with the error details: Anthropic says, “When contacting support about a specific request, include this ID to help us investigate the issue.” See Claude API Errors.
Log enough to connect the failure to the request without storing secrets or private content. Useful fields are:
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- Timestamp and endpoint path
- WordPress
WP_Errorcode/message, if there was no HTTP response - HTTP status, Anthropic error type and message, and request ID, if there was a response
- Configured model identifier and a sanitized indication of request size
Do not log the Anthropic API key, full authorization headers, or private prompt content. Anthropic’s request ID is particularly useful if you need support to investigate a specific response.
3. Match the HTTP status to the right first check
Anthropic documents the following meanings in its API error reference. Read the response body as well as the status: the error type and message can clarify which cause applies.
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| Status | Documented meaning | First check |
|---|---|---|
| 400 | Invalid request; may also indicate some organization or workspace spending limits. | Inspect validation details, fields, and model-specific parameters; check whether an account spend limit is involved. |
| 401 | Authentication error; the key may be malformed, revoked, or expired. | Verify that server-side code sends the correct active Anthropic key and that no code path or proxy truncates or substitutes it. |
| 402 | Billing error. | Check billing and payment status for the applicable Anthropic account. |
| 403 | Permission error. | Check organization or workspace access and permission to use the requested resource. |
| 404 | Requested resource not found. | Verify the endpoint path and resource or model identifier. |
| 409 | Conflict with the current resource state. | Inspect the operation and whether concurrent changes or a uniqueness conflict occurred. |
| 413 | Request too large. | Reduce the payload or use a supported workflow; compare it with the documented limit for that endpoint. |
| 429 | Rate limit, monthly spend cap, or certain workspace spend limits. | Inspect usage and account limits. Determine whether this is a transient rate limit or a spending restriction before retrying. |
| 500 | Unexpected internal API error. | Retry with exponential backoff; if it persists, contact support with the request ID. |
| 504 | Request timed out during processing. | Check request duration and consider streaming for long work. |
| 529 | API temporarily overloaded. | Treat it as temporary service overload and use restrained retry behavior rather than flooding the endpoint. |
4. Check request construction and endpoint limits
For an HTTP error, verify that the integration is calling the intended endpoint and sending the authentication header, JSON content type, valid JSON, required fields, and a supported model identifier. Model availability changes; check Anthropic’s current model IDs and deprecation guidance rather than assuming an identifier in old code remains available.
Anthropic’s error documentation gives these maximum request sizes for its endpoints:
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| Anthropic endpoint | Maximum request size |
|---|---|
| Messages and Token Counting | 32 MB |
| Batch | 256 MB |
| Files | 500 MB |
These are Anthropic endpoint ceilings, not limits guaranteed by WordPress or your host. PHP, a proxy, a firewall, or hosting configuration may impose a lower limit. Anthropic documents a 413 response when the applicable endpoint maximum is exceeded; investigate host-side limits separately.
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Transient rate limits and server errors
A 429 can indicate a rate limit, but it can also indicate a monthly spend cap or certain workspace spending limits. Anthropic notes that a spending-cap 429 may lack a retry-after header and can persist until access resumes. Identify the cause from the response and account limits instead of repeatedly resending the same request. For 500 errors, Anthropic recommends exponential backoff; for 529 overload responses, avoid rapid repeated attempts.
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Long-running requests
A 504 indicates that processing timed out. Anthropic suggests Messages streaming or Message Batches for long requests, especially requests exceeding 10 minutes. Choose an approach that fits the integration: streaming is useful when the application needs to receive output as it is generated, while Batches suit supported asynchronous processing workflows.
6. Keep Anthropic credentials separate from WordPress REST credentials
Server-side WordPress code calling Claude must authenticate to Anthropic with an Anthropic API credential. Keep that key on the server; never expose it in browser JavaScript.
WordPress Application Passwords authenticate a client to the WordPress REST API as a WordPress user. They are revocable, per-application credentials, normally used with HTTP Basic Authentication over HTTPS. They do not replace the Anthropic key. If the failing request is instead a WordPress REST 401 or 403, check that HTTPS is correctly detected, an Application Password rather than the user’s regular password is being used, the feature is enabled, and a proxy or client has not stripped the Authorization header.
WordPress’s REST API reference describes JSON requests and responses, including errors, and the use of HTTP response codes to indicate errors. That applies to WordPress REST interactions; for a custom plugin’s Claude call, inspect the actual upstream Anthropic response.
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7. Make the next failure diagnosable
- Capture the exact outcome: either the WordPress error code/message or the HTTP status and body.
- For an HTTP error, retain Anthropic’s error type, message, and request ID from the JSON or response header.
- Record the endpoint path, configured model identifier, timestamp, and a sanitized request-size indication.
- Redact the API key, authorization headers, and private prompt content before storing or sharing logs.
With the exact status or redacted WordPress error in hand, you can distinguish a networking problem from an Anthropic response and route the issue to the relevant configuration, account, or retry check.
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