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Co-authored-by: Jeremiah Lowin <jlowin@users.noreply.github.com> Co-authored-by: marvin-context-protocol[bot] <225465937+marvin-context-protocol[bot]@users.noreply.github.com>
60 lines
2 KiB
Text
60 lines
2 KiB
Text
---
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title: error_handling
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sidebarTitle: error_handling
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---
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# `fastmcp.server.middleware.error_handling`
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Error handling middleware for consistent error responses and tracking.
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## Classes
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### `ErrorHandlingMiddleware` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/middleware/error_handling.py#L15" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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Middleware that provides consistent error handling and logging.
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Catches exceptions, logs them appropriately, and converts them to
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proper MCP error responses. Also tracks error patterns for monitoring.
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**Methods:**
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#### `on_message` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/middleware/error_handling.py#L110" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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on_message(self, context: MiddlewareContext, call_next: CallNext) -> Any
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```
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Handle errors for all messages.
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#### `get_error_stats` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/middleware/error_handling.py#L121" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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get_error_stats(self) -> dict[str, int]
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```
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Get error statistics for monitoring.
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### `RetryMiddleware` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/middleware/error_handling.py#L126" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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Middleware that implements automatic retry logic for failed requests.
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Retries requests that fail with transient errors, using exponential
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backoff to avoid overwhelming the server or external dependencies.
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**Methods:**
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#### `on_request` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/middleware/error_handling.py#L182" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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on_request(self, context: MiddlewareContext, call_next: CallNext) -> Any
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```
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Implement retry logic for requests.
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