diff --git a/promptlens/providers/http.py b/promptlens/providers/http.py
index f1828e2..be7033d 100644
--- a/promptlens/providers/http.py
+++ b/promptlens/providers/http.py
@@ -5,6 +5,7 @@
 from typing import Any, Dict, List, Optional
 
 import aiohttp
+from aiohttp import ContentTypeError
 
 from promptlens.models.config import ProviderConfig
 from promptlens.models.result import ModelResponse
@@ -59,6 +60,11 @@ def _extract_content(data: Dict[str, Any]) -> str:
 
         return ""
 
+    @staticmethod
+    def _extract_content_from_text_response(text: str) -> str:
+        """Extract usable content from plain-text HTTP responses."""
+        return text.strip()
+
     def __init__(self, config: ProviderConfig) -> None:
         """Initialize the HTTP provider.
 
@@ -119,10 +125,14 @@ async def _make_request() -> ModelResponse:
                         timeout=aiohttp.ClientTimeout(total=self.config.timeout),
                     ) as response:
                         response.raise_for_status()
-                        data = await response.json()
-
-                # Extract content (try common response formats)
-                content = self._extract_content(data)
+                        try:
+                            data = await response.json()
+                            content = self._extract_content(data)
+                        except ContentTypeError:
+                            text = await response.text()
+                            content = self._extract_content_from_text_response(text)
+
+                # Extracted content from JSON shape or plain text body.
 
                 # Local models typically don't provide token counts or cost
                 return ModelResponse(
diff --git a/tests/test_http_provider_response_parsing.py b/tests/test_http_provider_response_parsing.py
index 0949b6e..8d82f20 100644
--- a/tests/test_http_provider_response_parsing.py
+++ b/tests/test_http_provider_response_parsing.py
@@ -57,3 +57,9 @@ def test_extract_content_returns_empty_for_unknown_shape() -> None:
     provider = _provider()
 
     assert provider._extract_content({"foo": "bar"}) == ""
+
+
+def test_extract_content_from_text_response_strips_whitespace() -> None:
+    provider = _provider()
+
+    assert provider._extract_content_from_text_response("  hello world\n") == "hello world"