diff --git a/src/server/context.rs b/src/server/context.rs
index bbad080..765d937 100644
--- a/src/server/context.rs
+++ b/src/server/context.rs
@@ -124,7 +124,7 @@ impl Context {
 		uriproxy::uri(self.base(), UriClass::Context, id)
 	}
 
-	/// get bare id, which is uuid for local stuff and ~{uri|base64} for remote stuff
+	/// get bare id, which is uuid for local stuff and +{uri|base64} for remote stuff
 	pub fn id(&self, full_id: &str) -> String {
 		if self.is_local(full_id) {
 			uriproxy::decompose_id(full_id)
diff --git a/uriproxy/src/lib.rs b/uriproxy/src/lib.rs
index 41dc53f..2feb6ba 100644
--- a/uriproxy/src/lib.rs
+++ b/uriproxy/src/lib.rs
@@ -21,8 +21,8 @@ impl AsRef<str> for UriClass {
 
 /// unpack uri in id if valid, otherwise compose full uri with "{base}/{entity}/{id}"
 pub fn uri(base: &str, entity: UriClass, id: &str) -> String {
-	if id.starts_with('~') { // ready-to-use base64-encoded id
-		if let Ok(bytes) = base64::prelude::BASE64_STANDARD.decode(id) {
+	if id.starts_with('+') { // ready-to-use base64-encoded id
+		if let Ok(bytes) = base64::prelude::BASE64_URL_SAFE.decode(id) {
 			if let Ok(uri) = std::str::from_utf8(&bytes) {
 				return uri.to_string();
 			}
@@ -40,8 +40,8 @@ pub fn decompose_id(full_id: &str) -> String {
 			.to_string()
 }
 
-/// encode with base64 remote url and prefix it with ~
+/// encode with base64 remote url and prefix it with +
 pub fn compact_id(uri: &str) -> String {
-	let encoded = base64::prelude::BASE64_STANDARD.encode(uri.as_bytes());
-	format!("~{encoded}")
+	let encoded = base64::prelude::BASE64_URL_SAFE.encode(uri.as_bytes());
+	format!("+{encoded}")
 }