diff --git a/deploy.env b/deploy.env
index fbeffa1f..e161ffb3 100644
--- a/deploy.env
+++ b/deploy.env
@@ -139,3 +139,6 @@ APPFLOWY_INDEXER_REDIS_URL=redis://redis:6379
 # AppFlowy Collaborate
 APPFLOWY_COLLABORATE_MULTI_THREAD=false
 APPFLOWY_COLLABORATE_REMOVE_BATCH_SIZE=100
+
+# AppFlowy Web
+APPFLOWY_WEB_URL=
diff --git a/dev.env b/dev.env
index 4b4d5bde..bbec40c5 100644
--- a/dev.env
+++ b/dev.env
@@ -125,3 +125,6 @@ APPFLOWY_INDEXER_REDIS_URL=redis://redis:6379
 # AppFlowy Collaborate
 APPFLOWY_COLLABORATE_MULTI_THREAD=false
 APPFLOWY_COLLABORATE_REMOVE_BATCH_SIZE=100
+
+# AppFlowy Web
+APPFLOWY_WEB_URL=
diff --git a/libs/infra/src/env_util.rs b/libs/infra/src/env_util.rs
index f9f4e35f..697ad209 100644
--- a/libs/infra/src/env_util.rs
+++ b/libs/infra/src/env_util.rs
@@ -8,3 +8,21 @@ pub fn get_env_var(key: &str, default: &str) -> String {
     default.to_owned()
   })
 }
+
+/// Optionally get an environment variable.
+/// if value is empty, return None.
+pub fn get_env_var_opt(key: &str) -> Option<String> {
+  match std::env::var(key) {
+    Ok(val) => {
+      if val.is_empty() {
+        None
+      } else {
+        Some(val)
+      }
+    },
+    Err(e) => {
+      tracing::warn!("failed to read environment variable: {}, None set", e);
+      None
+    },
+  }
+}
diff --git a/src/config/config.rs b/src/config/config.rs
index 4fdc639d..0786f463 100644
--- a/src/config/config.rs
+++ b/src/config/config.rs
@@ -7,7 +7,7 @@ use semver::Version;
 use serde::Deserialize;
 use sqlx::postgres::{PgConnectOptions, PgSslMode};
 
-use infra::env_util::get_env_var;
+use infra::env_util::{get_env_var, get_env_var_opt};
 
 #[derive(Clone, Debug)]
 pub struct Config {
@@ -245,7 +245,7 @@ pub fn get_configuration() -> Result<Config, anyhow::Error> {
       client_id: get_env_var("APPFLOWY_APPLE_OAUTH_CLIENT_ID", ""),
       client_secret: get_env_var("APPFLOWY_APPLE_OAUTH_CLIENT_SECRET", "").into(),
     },
-    appflowy_web_url: std::env::var("APPFLOWY_WEB_URL").ok(),
+    appflowy_web_url: get_env_var_opt("APPFLOWY_WEB_URL"),
   };
   Ok(config)
 }