From 12fb0663d1ecc67832b28ed107935a97432216c1 Mon Sep 17 00:00:00 2001
From: Emmanuel Jaep <2668031+jaepetto@users.noreply.github.com>
Date: Tue, 25 Oct 2022 16:04:23 +0200
Subject: [PATCH] FIX content-length header gets incorrectly set to 0 by
 default

---
 src/fastapi_redis_cache/cache.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/fastapi_redis_cache/cache.py b/src/fastapi_redis_cache/cache.py
index 5257a14..d2cfbd2 100644
--- a/src/fastapi_redis_cache/cache.py
+++ b/src/fastapi_redis_cache/cache.py
@@ -39,6 +39,11 @@ async def inner_wrapper(*args, **kwargs):
             create_response_directly = not response
             if create_response_directly:
                 response = Response()
+                # The response may get created with a 'content-length' header equal to 0. Of course, if the `func` function does return something, this header becomes a mismatch with the actual content.
+                # uvicorn is sensible to it and then raises a 'RuntimeError: Response content longer than Content-Length' exception.
+                # As a workaround, the 'content-length' header is cleared from the response.headers if it exists
+                if "content-length" in response.headers.keys():
+                    del response.headers["content-length"]
             redis_cache = FastApiRedisCache()
             if redis_cache.not_connected or redis_cache.request_is_not_cacheable(request):
                 # if the redis client is not connected or request is not cacheable, no caching behavior is performed.