latest updates

src/openrouter/utils/forms.py

@@ -142,16 +142,21 @@ def serialize_multipart_form(
         if field_metadata.file:
             if isinstance(val, List):
                 # Handle array of files
+                array_field_name = f_name + "[]"
                 for file_obj in val:
                     if not _is_set(file_obj):
                         continue
-                        
-                    file_name, content, content_type = _extract_file_properties(file_obj)
+
+                    file_name, content, content_type = _extract_file_properties(
+                        file_obj
+                    )
 
                     if content_type is not None:
-                        files.append((f_name + "[]", (file_name, content, content_type)))
+                        files.append(
+                            (array_field_name, (file_name, content, content_type))
+                        )
                     else:
-                        files.append((f_name + "[]", (file_name, content)))
+                        files.append((array_field_name, (file_name, content)))
             else:
                 # Handle single file
                 file_name, content, content_type = _extract_file_properties(val)
@@ -161,11 +166,16 @@ def serialize_multipart_form(
                 else:
                     files.append((f_name, (file_name, content)))
         elif field_metadata.json:
-            files.append((f_name, (
-                None,
-                marshal_json(val, request_field_types[name]),
-                "application/json",
-            )))
+            files.append(
+                (
+                    f_name,
+                    (
+                        None,
+                        marshal_json(val, request_field_types[name]),
+                        "application/json",
+                    ),
+                )
+            )
         else:
             if isinstance(val, List):
                 values = []
@@ -175,7 +185,8 @@ def serialize_multipart_form(
                         continue
                     values.append(_val_to_string(value))
 
-                form[f_name + "[]"] = values
+                array_field_name = f_name + "[]"
+                form[array_field_name] = values
             else:
                 form[f_name] = _val_to_string(val)
     return media_type, form, files

src/openrouter/utils/queryparams.py

@@ -27,12 +27,13 @@ from .forms import _populate_form
 def get_query_params(
     query_params: Any,
     gbls: Optional[Any] = None,
+    allow_empty_value: Optional[List[str]] = None,
 ) -> Dict[str, List[str]]:
     params: Dict[str, List[str]] = {}
 
-    globals_already_populated = _populate_query_params(query_params, gbls, params, [])
+    globals_already_populated = _populate_query_params(query_params, gbls, params, [], allow_empty_value)
     if _is_set(gbls):
-        _populate_query_params(gbls, None, params, globals_already_populated)
+        _populate_query_params(gbls, None, params, globals_already_populated, allow_empty_value)
 
     return params
 
@@ -42,6 +43,7 @@ def _populate_query_params(
     gbls: Any,
     query_param_values: Dict[str, List[str]],
     skip_fields: List[str],
+    allow_empty_value: Optional[List[str]] = None,
 ) -> List[str]:
     globals_already_populated: List[str] = []
 
@@ -69,6 +71,16 @@ def _populate_query_params(
             globals_already_populated.append(name)
 
         f_name = field.alias if field.alias is not None else name
+
+        allow_empty_set = set(allow_empty_value or [])
+        should_include_empty = f_name in allow_empty_set and (
+            value is None or value == [] or value == ""
+        )
+
+        if should_include_empty:
+            query_param_values[f_name] = [""]
+            continue
+
         serialization = metadata.serialization
         if serialization is not None:
             serialized_parms = _get_serialized_params(

src/openrouter/utils/retries.py

@@ -3,7 +3,9 @@
 import asyncio
 import random
 import time
-from typing import List
+from datetime import datetime
+from email.utils import parsedate_to_datetime
+from typing import List, Optional
 
 import httpx
 
@@ -51,9 +53,11 @@ class Retries:
 
 class TemporaryError(Exception):
     response: httpx.Response
+    retry_after: Optional[int]
 
     def __init__(self, response: httpx.Response):
         self.response = response
+        self.retry_after = _parse_retry_after_header(response)
 
 
 class PermanentError(Exception):
@@ -63,6 +67,62 @@ class PermanentError(Exception):
         self.inner = inner
 
 
+def _parse_retry_after_header(response: httpx.Response) -> Optional[int]:
+    """Parse Retry-After header from response.
+
+    Returns:
+        Retry interval in milliseconds, or None if header is missing or invalid.
+    """
+    retry_after_header = response.headers.get("retry-after")
+    if not retry_after_header:
+        return None
+
+    try:
+        seconds = float(retry_after_header)
+        return round(seconds * 1000)
+    except ValueError:
+        pass
+
+    try:
+        retry_date = parsedate_to_datetime(retry_after_header)
+        delta = (retry_date - datetime.now(retry_date.tzinfo)).total_seconds()
+        return round(max(0, delta) * 1000)
+    except (ValueError, TypeError):
+        pass
+
+    return None
+
+
+def _get_sleep_interval(
+    exception: Exception,
+    initial_interval: int,
+    max_interval: int,
+    exponent: float,
+    retries: int,
+) -> float:
+    """Get sleep interval for retry with exponential backoff.
+
+    Args:
+        exception: The exception that triggered the retry.
+        initial_interval: Initial retry interval in milliseconds.
+        max_interval: Maximum retry interval in milliseconds.
+        exponent: Base for exponential backoff calculation.
+        retries: Current retry attempt count.
+
+    Returns:
+        Sleep interval in seconds.
+    """
+    if (
+        isinstance(exception, TemporaryError)
+        and exception.retry_after is not None
+        and exception.retry_after > 0
+    ):
+        return exception.retry_after / 1000
+
+    sleep = (initial_interval / 1000) * exponent**retries + random.uniform(0, 1)
+    return min(sleep, max_interval / 1000)
+
+
 def retry(func, retries: Retries):
     if retries.config.strategy == "backoff":
 
@@ -183,8 +243,10 @@ def retry_with_backoff(
                     return exception.response
 
                 raise
-            sleep = (initial_interval / 1000) * exponent**retries + random.uniform(0, 1)
-            sleep = min(sleep, max_interval / 1000)
+
+            sleep = _get_sleep_interval(
+                exception, initial_interval, max_interval, exponent, retries
+            )
             time.sleep(sleep)
             retries += 1
 
@@ -211,7 +273,9 @@ async def retry_with_backoff_async(
                     return exception.response
 
                 raise
-            sleep = (initial_interval / 1000) * exponent**retries + random.uniform(0, 1)
-            sleep = min(sleep, max_interval / 1000)
+
+            sleep = _get_sleep_interval(
+                exception, initial_interval, max_interval, exponent, retries
+            )
             await asyncio.sleep(sleep)
             retries += 1