Added LlamaNodes ChunkedEncodingError

eth_defi/middleware.py

@@ -20,7 +20,7 @@
     ConnectionError,
     HTTPError,
     Timeout,
-    TooManyRedirects,
+    TooManyRedirects, ChunkedEncodingError,
 )
 from web3._utils.transactions import get_buffered_gas_estimate
 from eth_utils.toolz import assoc
@@ -47,6 +47,14 @@
     # but we'll add it here just to work around this crappy provider
     # by default.
     BlockNotFound,
+
+    # Spit out by LlamaNodes.
+    #
+    # Their server give invalid HTTP reply.
+    #
+    # requests.exceptions.ChunkedEncodingError: ("Connection broken: InvalidChunkLength(got length b'', 0 bytes read)", InvalidChunkLength(got length b'', 0 bytes read))
+    #
+    ChunkedEncodingError,
 )
 
 #: List of HTTP status codes we know we might want to retry after a timeout

eth_defi/provider/broken_provider.py

@@ -50,10 +50,16 @@ def get_block_tip_latency(web3: Web3) -> int:
 
     - Defaults to zero
 
-    - We have some built-in rules to work around broken providers like Ankr
+    - If using :py:class:`eth_defi.provider.fallback.FallbackProvider`
+      we use 4 blocks latency as multiple providers are unlikely
+      to agree on a chain tip (blocks have not propagated yet).
+
+    - We have some built-in rules to work out specific providers
 
     - You can override this by setting the latency sa ``web3.block_tip_latency`` attribute
 
+    See the source code of :py:func:`get_default_block_tip_latency` for other rules.
+
     Example:
 
     .. code-block:: python