build: always use httpx instead of requests; improve HTTP errors

haystack/components/connectors/openapi_service.py

@@ -174,7 +174,7 @@ class OpenAPIServiceConnector:
     <!-- test-ignore -->
     ```python
     import json
-    import requests
+    import httpx
 
     from haystack.components.connectors import OpenAPIServiceConnector
     from haystack.dataclasses import ChatMessage, ToolCall
@@ -187,7 +187,7 @@ class OpenAPIServiceConnector:
     message = ChatMessage.from_assistant(tool_calls=[tool_call])
 
     serper_token = Secret.from_env_var("SERPERDEV_API_KEY").resolve_value()
-    serperdev_openapi_spec = json.loads(requests.get("https://bit.ly/serper_dev_spec").text)
+    serperdev_openapi_spec = json.loads(httpx.get("https://bit.ly/serper_dev_spec", follow_redirects=True).text)
     service_connector = OpenAPIServiceConnector()
     result = service_connector.run(
         messages=[message],

haystack/components/rankers/hugging_face_tei.py

@@ -7,6 +7,8 @@
 from typing import Any
 from urllib.parse import urljoin
 
+import httpx
+
 from haystack import Document, component, default_from_dict, default_to_dict
 from haystack.utils import Secret
 from haystack.utils.misc import _deduplicate_documents
@@ -133,7 +135,7 @@ def _compose_response(
         :returns: A dictionary with the following keys:
             - `documents`: A list of reranked documents.
 
-        :raises requests.exceptions.RequestException:
+        :raises RuntimeError:
             - If the API request fails.
 
         :raises RuntimeError:
@@ -186,7 +188,7 @@ def run(
         :returns: A dictionary with the following keys:
             - `documents`: A list of reranked documents.
 
-        :raises requests.exceptions.RequestException:
+        :raises RuntimeError:
             - If the API request fails.
 
         :raises RuntimeError:
@@ -211,15 +213,18 @@ def run(
             headers["Authorization"] = f"Bearer {self.token.resolve_value()}"
 
         # Call the external service with retry
-        response = request_with_retry(
-            method="POST",
-            url=urljoin(self.url, "/rerank"),
-            json=payload,
-            timeout=self.timeout,
-            headers=headers,
-            attempts=self.max_retries,
-            status_codes_to_retry=self.retry_status_codes,
-        )
+        try:
+            response = request_with_retry(
+                method="POST",
+                url=urljoin(self.url, "/rerank"),
+                json=payload,
+                timeout=self.timeout,
+                headers=headers,
+                attempts=self.max_retries,
+                status_codes_to_retry=self.retry_status_codes,
+            )
+        except httpx.HTTPStatusError as e:
+            raise RuntimeError(f"HuggingFaceTEIRanker API call failed. Error: {e}, Response: {e.response.text}") from e
 
         result: dict[str, str] | list[dict[str, Any]] = response.json()
 
@@ -270,15 +275,18 @@ async def run_async(
             headers["Authorization"] = f"Bearer {self.token.resolve_value()}"
 
         # Call the external service with retry
-        response = await async_request_with_retry(
-            method="POST",
-            url=urljoin(self.url, "/rerank"),
-            json=payload,
-            timeout=self.timeout,
-            headers=headers,
-            attempts=self.max_retries,
-            status_codes_to_retry=self.retry_status_codes,
-        )
+        try:
+            response = await async_request_with_retry(
+                method="POST",
+                url=urljoin(self.url, "/rerank"),
+                json=payload,
+                timeout=self.timeout,
+                headers=headers,
+                attempts=self.max_retries,
+                status_codes_to_retry=self.retry_status_codes,
+            )
+        except httpx.HTTPStatusError as e:
+            raise RuntimeError(f"HuggingFaceTEIRanker API call failed. Error: {e}, Response: {e.response.text}") from e
 
         result: dict[str, str] | list[dict[str, Any]] = response.json()
 

haystack/components/websearch/searchapi.py

@@ -114,6 +114,11 @@ def run(self, query: str) -> dict[str, list[Document] | list[str]]:
         except httpx.ConnectTimeout as error:
             raise TimeoutError(f"Request to {self.__class__.__name__} timed out.") from error
 
+        except httpx.HTTPStatusError as e:
+            raise SearchApiError(
+                f"An error occurred while querying {self.__class__.__name__}. Error: {e}, Response: {e.response.text}"
+            ) from e
+
         except httpx.HTTPError as e:
             raise SearchApiError(f"An error occurred while querying {self.__class__.__name__}. Error: {e}") from e
 
@@ -149,6 +154,11 @@ async def run_async(self, query: str) -> dict[str, list[Document] | list[str]]:
         except httpx.ConnectTimeout as error:
             raise TimeoutError(f"Request to {self.__class__.__name__} timed out.") from error
 
+        except httpx.HTTPStatusError as e:
+            raise SearchApiError(
+                f"An error occurred while querying {self.__class__.__name__}. Error: {e}, Response: {e.response.text}"
+            ) from e
+
         except httpx.HTTPError as e:
             raise SearchApiError(f"An error occurred while querying {self.__class__.__name__}. Error: {e}") from e
 

haystack/components/websearch/serper_dev.py

@@ -159,6 +159,11 @@ def run(self, query: str) -> dict[str, list[Document] | list[str]]:
         except httpx.ConnectTimeout as error:
             raise TimeoutError(f"Request to {self.__class__.__name__} timed out.") from error
 
+        except httpx.HTTPStatusError as e:
+            raise SerperDevError(
+                f"An error occurred while querying {self.__class__.__name__}. Error: {e}, Response: {e.response.text}"
+            ) from e
+
         except httpx.HTTPError as e:
             raise SerperDevError(f"An error occurred while querying {self.__class__.__name__}. Error: {e}") from e
 
@@ -194,6 +199,11 @@ async def run_async(self, query: str) -> dict[str, list[Document] | list[str]]:
         except httpx.ConnectTimeout as error:
             raise TimeoutError(f"Request to {self.__class__.__name__} timed out.") from error
 
+        except httpx.HTTPStatusError as e:
+            raise SerperDevError(
+                f"An error occurred while querying {self.__class__.__name__}. Error: {e}, Response: {e.response.text}"
+            ) from e
+
         except httpx.HTTPError as e:
             raise SerperDevError(f"An error occurred while querying {self.__class__.__name__}. Error: {e}") from e
 

haystack/core/pipeline/draw.py

@@ -9,8 +9,8 @@
 import zlib
 from typing import Any
 
+import httpx
 import networkx
-import requests
 
 from haystack import logging
 from haystack.core.errors import PipelineDrawingError
@@ -234,7 +234,7 @@ def _to_mermaid_image(
 
     logger.debug("Rendering graph at {url}", url=url)
     try:
-        resp = requests.get(url, timeout=timeout)
+        resp = httpx.get(url, timeout=timeout)
         if resp.status_code >= 400:
             logger.warning(
                 "Failed to draw the pipeline: {server_url} returned status {status_code}",

haystack/utils/requests_utils.py

@@ -6,15 +6,14 @@
 from typing import Any
 
 import httpx
-import requests
 from tenacity import after_log, before_log, retry, retry_if_exception_type, stop_after_attempt, wait_exponential
 
 logger = logging.getLogger(__file__)
 
 
 def request_with_retry(
     attempts: int = 3, status_codes_to_retry: list[int] | None = None, **kwargs: Any
-) -> requests.Response:
+) -> httpx.Response:
     """
     Executes an HTTP request with a configurable exponential backoff retry on failures.
 
@@ -35,26 +34,11 @@ def request_with_retry(
     # Sending an HTTP request with custom timeout in seconds
     res = request_with_retry(method="GET", url="https://example.com", timeout=5)
 
-    # Sending an HTTP request with custom authorization handling
-    class CustomAuth(requests.auth.AuthBase):
-        def __call__(self, r):
-            r.headers["authorization"] = "Basic <my_token_here>"
-            return r
-
-    res = request_with_retry(method="GET", url="https://example.com", auth=CustomAuth())
-
-    # All of the above combined
-    res = request_with_retry(
-        method="GET",
-        url="https://example.com",
-        auth=CustomAuth(),
-        attempts=10,
-        status_codes_to_retry=[408, 503],
-        timeout=5
-    )
+    # Sending an HTTP request with custom headers
+    res = request_with_retry(method="GET", url="https://example.com", headers={"Authorization": "Bearer <token>"})
 
     # Sending a POST request
-    res = request_with_retry(method="POST", url="https://example.com", data={"key": "value"}, attempts=10)
+    res = request_with_retry(method="POST", url="https://example.com", json={"key": "value"}, attempts=10)
 
     # Retry all 5xx status codes
     res = request_with_retry(method="GET", url="https://example.com", status_codes_to_retry=list(range(500, 600)))
@@ -66,9 +50,9 @@ def __call__(self, r):
         List of HTTP status codes that will trigger a retry.
         When param is `None`, HTTP 408, 418, 429 and 503 will be retried.
     :param kwargs:
-        Optional arguments that `request` accepts.
+        Optional arguments that `httpx.Client.request` accepts.
     :returns:
-        The `Response` object.
+        The `httpx.Response` object.
     """
 
     if status_codes_to_retry is None:
@@ -77,20 +61,21 @@ def __call__(self, r):
     @retry(
         reraise=True,
         wait=wait_exponential(),
-        retry=retry_if_exception_type((requests.HTTPError, TimeoutError)),
+        retry=retry_if_exception_type((httpx.HTTPError, TimeoutError)),
         stop=stop_after_attempt(attempts),
         before=before_log(logger, logging.DEBUG),
         after=after_log(logger, logging.DEBUG),
     )
-    def run() -> requests.Response:
+    def run() -> httpx.Response:
         timeout = kwargs.pop("timeout", 10)
-        res = requests.request(**kwargs, timeout=timeout)
+        with httpx.Client() as client:
+            res = client.request(**kwargs, timeout=timeout)
 
-        if res.status_code in status_codes_to_retry:
-            # We raise only for the status codes that must trigger a retry
-            res.raise_for_status()
+            if res.status_code in status_codes_to_retry:
+                # We raise only for the status codes that must trigger a retry
+                res.raise_for_status()
 
-        return res
+            return res
 
     res = run()
     # We raise here too in case the request failed with a status code that

pyproject.toml

@@ -54,7 +54,7 @@ dependencies = [
   "more-itertools",         # TextDocumentSplitter
   "networkx",               # Pipeline graphs
   "typing_extensions>=4.7", # Extended typing features (NotRequired, etc.)
-  "requests",
+  "httpx",
   "numpy",
   "python-dateutil",
   "jsonschema",             # JsonSchemaValidator, Tool

releasenotes/notes/httpx-3f5560ae23ab91b1.yaml

@@ -0,0 +1,13 @@
+---
+enhancements:
+  - |
+    Standardize HTTP request handling in Haystack by adopting ``httpx`` for both synchronous and asynchronous requests,
+    replacing ``requests``. Error reporting for failed requests has also been improved: exceptions now include
+    additional details alongside the reason field.
+upgrade:
+  - |
+    As part of the migration from ``requests`` to ``httpx``, ``request_with_retry`` and ``async_request_with_retry``
+    (in ``haystack.utils.requests_utils``) no longer raise ``requests.exceptions.RequestException`` on failure;
+    they now raise ``httpx.HTTPError`` instead. This also affects ``HuggingFaceTEIRanker``, which relies on these
+    utilities. Users catching ``requests.exceptions.RequestException`` should update their code to catch
+    ``httpx.HTTPError``.

test/components/connectors/test_openapi_service.py

@@ -7,8 +7,8 @@
 from typing import Any
 from unittest.mock import MagicMock, Mock, patch
 
+import httpx
 import pytest
-import requests
 from openapi3 import OpenAPI
 
 from haystack import Pipeline
@@ -266,10 +266,11 @@ def prepare_fc_params(openai_functions_schema: dict[str, Any]) -> dict[str, Any]
         pipe.connect("openapi_container.service_response", "final_prompt_adapter.service_response")
         pipe.connect("final_prompt_adapter", "llm.messages")
 
-        serperdev_spec = requests.get(
-            "https://gist.githubusercontent.com/vblagoje/241a000f2a77c76be6efba71d49e2856/raw/722ccc7fe6170a744afce3e3fb3a30fdd095c184/serper.json"
+        serperdev_spec = httpx.get(
+            "https://gist.githubusercontent.com/vblagoje/241a000f2a77c76be6efba71d49e2856/raw/722ccc7fe6170a744afce3e3fb3a30fdd095c184/serper.json",
+            follow_redirects=True,
         ).json()
-        system_prompt = requests.get("https://bit.ly/serper_dev_system").text
+        system_prompt = httpx.get("https://bit.ly/serper_dev_system", follow_redirects=True).text
 
         query = "Why did Elon Musk sue OpenAI?"
 

test/components/rankers/test_hugging_face_tei.py

@@ -6,7 +6,6 @@
 
 import httpx
 import pytest
-import requests
 
 from haystack import Document
 from haystack.components.rankers.hugging_face_tei import HuggingFaceTEIRanker, TruncationDirection
@@ -93,7 +92,7 @@ def test_empty_documents(self, del_hf_env_vars):
     def test_run_with_mock(self, mock_request, del_hf_env_vars):
         """Test run method with mocked API response"""
         # Setup mock response
-        mock_response = MagicMock(spec=requests.Response)
+        mock_response = MagicMock(spec=httpx.Response)
         mock_response.json.return_value = [
             {"index": 2, "score": 0.95},
             {"index": 1, "score": 0.85},
@@ -141,7 +140,7 @@ def test_run_with_mock(self, mock_request, del_hf_env_vars):
     def test_run_with_truncation_direction(self, mock_request, del_hf_env_vars):
         """Test run method with truncation direction parameter"""
         # Setup mock response
-        mock_response = MagicMock(spec=requests.Response)
+        mock_response = MagicMock(spec=httpx.Response)
         mock_response.json.return_value = [{"index": 0, "score": 0.95}]
         mock_request.return_value = mock_response
 
@@ -174,7 +173,7 @@ def test_run_with_truncation_direction(self, mock_request, del_hf_env_vars):
     def test_run_with_custom_top_k(self, mock_request, del_hf_env_vars):
         """Test run method with custom top_k parameter"""
         # Setup mock response with 5 documents
-        mock_response = MagicMock(spec=requests.Response)
+        mock_response = MagicMock(spec=httpx.Response)
         mock_response.json.return_value = [
             {"index": 4, "score": 0.95},
             {"index": 3, "score": 0.90},
@@ -210,7 +209,7 @@ def test_run_with_custom_top_k(self, mock_request, del_hf_env_vars):
     @patch("haystack.components.rankers.hugging_face_tei.request_with_retry")
     def test_run_deduplicates_documents(self, mock_request, del_hf_env_vars):
         """Test that duplicate documents are removed before sending to the API."""
-        mock_response = MagicMock(spec=requests.Response)
+        mock_response = MagicMock(spec=httpx.Response)
         mock_response.json.return_value = [{"index": 1, "score": 0.9}, {"index": 0, "score": 0.2}]
         mock_request.return_value = mock_response
 
@@ -241,7 +240,7 @@ def test_run_deduplicates_documents(self, mock_request, del_hf_env_vars):
     def test_error_handling(self, mock_request, del_hf_env_vars):
         """Test error handling in the ranker"""
         # Setup mock response with error
-        mock_response = MagicMock(spec=requests.Response)
+        mock_response = MagicMock(spec=httpx.Response)
         mock_response.json.return_value = {"error": "Some error occurred", "error_type": "TestError"}
         mock_request.return_value = mock_response