diff --git a/invokeai/app/api/routers/images.py b/invokeai/app/api/routers/images.py
index a0428e772e..3da94df7f4 100644
--- a/invokeai/app/api/routers/images.py
+++ b/invokeai/app/api/routers/images.py
@@ -19,6 +19,9 @@ from ..dependencies import ApiDependencies
 
 images_router = APIRouter(prefix="/v1/images", tags=["images"])
 
+# images are immutable; set a high max-age
+IMAGE_MAX_AGE = 31536000
+
 
 @images_router.post(
     "/",
@@ -155,12 +158,14 @@ async def get_image_full(
         if not ApiDependencies.invoker.services.images.validate_path(path):
             raise HTTPException(status_code=404)
 
-        return FileResponse(
+        response = FileResponse(
             path,
             media_type="image/png",
             filename=image_name,
             content_disposition_type="inline",
         )
+        response.headers["Cache-Control"] = f"max-age={IMAGE_MAX_AGE}"
+        return response
     except Exception as e:
         raise HTTPException(status_code=404)
 
@@ -189,9 +194,11 @@ async def get_image_thumbnail(
         if not ApiDependencies.invoker.services.images.validate_path(path):
             raise HTTPException(status_code=404)
 
-        return FileResponse(
+        response = FileResponse(
             path, media_type="image/webp", content_disposition_type="inline"
         )
+        response.headers["Cache-Control"] = f"max-age={IMAGE_MAX_AGE}"
+        return response
     except Exception as e:
         raise HTTPException(status_code=404)
 
diff --git a/invokeai/app/invocations/latent.py b/invokeai/app/invocations/latent.py
index da99afc50f..b3f95f3658 100644
--- a/invokeai/app/invocations/latent.py
+++ b/invokeai/app/invocations/latent.py
@@ -519,9 +519,9 @@ class ResizeLatentsInvocation(BaseInvocation):
     # Inputs
     latents: Optional[LatentsField] = Field(
         description="The latents to resize")
-    width:                         int = Field(
+    width:                         Union[int, None] = Field(default=512,
         ge=64, multiple_of=8, description="The width to resize to (px)")
-    height:                        int = Field(
+    height:                        Union[int, None] = Field(default=512,
         ge=64, multiple_of=8, description="The height to resize to (px)")
     mode:   LATENTS_INTERPOLATION_MODE = Field(
         default="bilinear", description="The interpolation mode")