diff --git a/build/docker/api/application.conf b/build/docker/api/application.conf
index 43b6ee57e..ae17e08fc 100644
--- a/build/docker/api/application.conf
+++ b/build/docker/api/application.conf
@@ -327,8 +327,8 @@ akka.http {
   }
 
   parsing {
-    # Spray doesn't like the AWS4 headers
-    illegal-header-warnings = on
+    # Don't complain about the / in the AWS SigV4 auth header
+    ignore-illegal-header-for = ["authorization"]
   }
 }
 
diff --git a/modules/api/src/it/resources/application.conf b/modules/api/src/it/resources/application.conf
index 93455f620..3447542ac 100644
--- a/modules/api/src/it/resources/application.conf
+++ b/modules/api/src/it/resources/application.conf
@@ -329,8 +329,8 @@ akka.http {
   }
 
   parsing {
-    # Spray doesn't like the AWS4 headers
-    illegal-header-warnings = on
+    # Don't complain about the / in the AWS SigV4 auth header
+    ignore-illegal-header-for = ["authorization"]
   }
 }
 
diff --git a/modules/api/src/main/resources/application.conf b/modules/api/src/main/resources/application.conf
index 43b6ee57e..ae17e08fc 100644
--- a/modules/api/src/main/resources/application.conf
+++ b/modules/api/src/main/resources/application.conf
@@ -327,8 +327,8 @@ akka.http {
   }
 
   parsing {
-    # Spray doesn't like the AWS4 headers
-    illegal-header-warnings = on
+    # Don't complain about the / in the AWS SigV4 auth header
+    ignore-illegal-header-for = ["authorization"]
   }
 }
 
diff --git a/modules/api/src/test/resources/application.conf b/modules/api/src/test/resources/application.conf
index 2e5a0d2d5..9fac4d6f9 100644
--- a/modules/api/src/test/resources/application.conf
+++ b/modules/api/src/test/resources/application.conf
@@ -336,8 +336,8 @@ akka.http {
   }
 
   parsing {
-    # Spray doesn't like the AWS4 headers
-    illegal-header-warnings = on
+    # Don't complain about the / in the AWS SigV4 auth header
+    ignore-illegal-header-for = ["authorization"]
   }
 }
 
diff --git a/modules/api/src/universal/conf/application.conf b/modules/api/src/universal/conf/application.conf
index 43b6ee57e..ae17e08fc 100644
--- a/modules/api/src/universal/conf/application.conf
+++ b/modules/api/src/universal/conf/application.conf
@@ -327,8 +327,8 @@ akka.http {
   }
 
   parsing {
-    # Spray doesn't like the AWS4 headers
-    illegal-header-warnings = on
+    # Don't complain about the / in the AWS SigV4 auth header
+    ignore-illegal-header-for = ["authorization"]
   }
 }
 
diff --git a/modules/docs/src/main/mdoc/operator/config-api.md b/modules/docs/src/main/mdoc/operator/config-api.md
index dd626c5bd..2cb812756 100644
--- a/modules/docs/src/main/mdoc/operator/config-api.md
+++ b/modules/docs/src/main/mdoc/operator/config-api.md
@@ -792,8 +792,8 @@ v6-discovery-nibble-boundaries {
      }
    
      parsing {
-        # akka-http doesn't like the AWS4 headers
-        illegal-header-warnings = on
+        # Don't complain about the / in the AWS SigV4 auth header
+        ignore-illegal-header-for = ["authorization"]
      }
   }
 }
diff --git a/test/api/functional/application.conf b/test/api/functional/application.conf
index 86c9e70b3..c97482212 100644
--- a/test/api/functional/application.conf
+++ b/test/api/functional/application.conf
@@ -297,7 +297,7 @@ akka.http {
   }
 
   parsing {
-    # Spray doesn't like the AWS4 headers
-    illegal-header-warnings = on
+    # Don't complain about the / in the AWS SigV4 auth header
+    ignore-illegal-header-for = ["authorization"]
   }
 }
diff --git a/test/api/integration/application.conf b/test/api/integration/application.conf
index 5e152aa03..a8bcfa0d8 100644
--- a/test/api/integration/application.conf
+++ b/test/api/integration/application.conf
@@ -352,7 +352,7 @@ akka.http {
   }
 
   parsing {
-    # Spray doesn't like the AWS4 headers
-    illegal-header-warnings = on
+    # Don't complain about the / in the AWS SigV4 auth header
+    ignore-illegal-header-for = ["authorization"]
   }
 }