# Error Codes

[View original](https://ittybit.com/docs/errors)

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title: Error Codes
icon: error/red
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## 4xx Client Errors

### 400 Bad Request

The request was invalid or cannot be otherwise served. This is usually caused by a missing required parameter or an invalid parameter.

We will normally return a more specific error message that can help you fix the issue.

### 401 Unauthorized

The request requires user authentication. This is usually caused by a missing or invalid API key.

### 402 Payment Required

The request requires a payment to be made.  This is usually caused by a missing or invalid payment method.

We usually notify you well in advance of shutting off service for non-payment, however we reserve the right to do so if we are unable to reach you and an outstanding balance is not cleared promptly.

### 403 Forbidden

The request is forbidden. This is usually caused when the request has a valid API key, but the resource or action is not accessible to the API key.

### 404 Not Found

The requested resource was not found. This is usually caused by a missing or invalid resource ID.

### 405 Method Not Allowed

The request method is not allowed. Many endpoints support a subset of HTTP methods, and will return this error if the requested method is not supported.

### 408 Request Timeout

The request took too long to complete. This is usually caused by a slow network connection or a slow server.

### 410 Gone

The requested resource is no longer available. This is usually caused by a resource that has been deleted or expired.

### 413 Payload Too Large

The request payload is too large. This is usually caused by a large file or a large number of parameters.

You are most likely to see this when uploading a file.

Switching to HTTP/2 or upgrading your client lifts most restrictions on payload size.

### 429 Too Many Requests

The request was rate limited. This is usually caused by a high rate of requests in too short a period of time.

## 5xx Server Errors

### 500 Internal Server Error

The server encountered an error and was unable to process the request. This is usually caused by a bug in the server or an unexpected error on our side.

If you encounter this error, please [contact support](https://ittybit.com/support) and we will immediately look into it.

### 502 Bad Gateway

The server received an invalid response from a downstream server. This is usually caused by a problem with a downstream server.

### 503 Service Unavailable

The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.

## More Docs coming soon

We're currently updating this page with the most up-to-date info. Thanks for your patience!