default content type env var

Signed-off-by: Raphael Glon <oOraph@users.noreply.github.com>

Author: oOraph

src/huggingface_inference_toolkit/webservice_starlette.py

@@ -84,7 +84,7 @@ async def metrics(request):
 async def predict(request):
     try:
         # extracts content from request
-        content_type = request.headers.get("content-Type", None)
+        content_type = request.headers.get("content-Type", os.environ.get("DEFAULT_CONTENT_TYPE"))
         # try to deserialize payload
         deserialized_body = ContentType.get_deserializer(content_type).deserialize(
             await request.body()