Some work on making the dav crate framework-agnostic

Cargo.lock

@@ -1445,6 +1445,30 @@ dependencies = [
  "hashbrown 0.15.3",
 ]
 
+[[package]]
+name = "headers"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b3314d5adb5d94bcdf56771f2e50dbbc80bb4bdf88967526706205ac9eff24eb"
+dependencies = [
+ "base64 0.22.1",
+ "bytes",
+ "headers-core",
+ "http 1.3.1",
+ "httpdate",
+ "mime",
+ "sha1",
+]
+
+[[package]]
+name = "headers-core"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "54b4a22553d4242c49fddb9ba998a99962b5cc6f22cb5a3482bec22522403ce4"
+dependencies = [
+ "http 1.3.1",
+]
+
 [[package]]
 name = "heck"
 version = "0.5.0"
@@ -3096,6 +3120,8 @@ dependencies = [
  "async-trait",
  "derive_more 2.0.1",
  "futures-util",
+ "headers",
+ "http 0.2.12",
  "itertools 0.14.0",
  "log",
  "quick-xml",