diff --git a/lightrag/llm.py b/lightrag/llm.py
index b6d7a2a8..5ba2cfd4 100644
--- a/lightrag/llm.py
+++ b/lightrag/llm.py
@@ -350,7 +350,10 @@ async def ollama_model_if_cache(
     timeout = kwargs.pop("timeout", None)
     kwargs.pop("hashing_kv", None)
     api_key = kwargs.pop("api_key", None)
-    headers = {"Authorization": f"Bearer {api_key}"} if api_key else None
+    headers = {
+                "Content-Type": "application/json",
+                "Authorization": f"Bearer {api_key}"
+                } if api_key else {"Content-Type": "application/json"}
     ollama_client = ollama.AsyncClient(host=host, timeout=timeout, headers=headers)
     messages = []
     if system_prompt:
@@ -383,7 +386,10 @@ async def lollms_model_if_cache(
 
     stream = True if kwargs.get("stream") else False
     api_key = kwargs.pop("api_key", None)
-    headers = {"Authorization": f"Bearer {api_key}"} if api_key else None
+    headers = {
+                "Content-Type": "application/json",
+                "Authorization": f"Bearer {api_key}"
+                } if api_key else {"Content-Type": "application/json"}
 
     # Extract lollms specific parameters
     request_data = {
@@ -1154,9 +1160,9 @@ async def ollama_embedding(texts: list[str], embed_model, **kwargs) -> np.ndarra
 async def ollama_embed(texts: list[str], embed_model, **kwargs) -> np.ndarray:
     api_key = kwargs.pop("api_key", None)
     headers = (
-        {"Authorization": api_key, "Content-Type": "application/json"}
+        {"Content-Type": "application/json", "Authorization": api_key}
         if api_key
-        else None
+        else {"Content-Type": "application/json"}
     )
     kwargs["headers"] = headers
     ollama_client = ollama.Client(**kwargs)
@@ -1181,9 +1187,9 @@ async def lollms_embed(
     """
     api_key = kwargs.pop("api_key", None)
     headers = (
-        {"Authorization": api_key, "Content-Type": "application/json"}
+        {"Content-Type": "application/json", "Authorization": api_key}
         if api_key
-        else None
+        else {"Content-Type": "application/json"}
     )
     async with aiohttp.ClientSession(headers=headers) as session:
         embeddings = []