diff --git a/.dockerignore b/.dockerignore
index d16cb6a..b68852a 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -4,4 +4,3 @@
 target/
 log/
 plugins/
-legacy/
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 86f2c3b..4cba6d8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,7 +13,18 @@
 You should also include the user name that made the change.
 -->
 
-## 0.1.6 (unreleased)
+## 0.3.0 (Unreleased)
+
+### Improvements
+
+- Totally restructured and reimplemented all components
+- Support multiple bootstrap resolvers.
+- Periodic health check of all path candidates.
+- Periodic nexthop IP address resolution via the proxy itself, bootstrap resolver is only used at the first time and fall-back.
+- Periodic fetching of access token with refresh token.
+- Hot reloading of configuration files, including block and override files.
+
+## 0.2.0
 
 ### Improvements
 
@@ -22,6 +33,7 @@ You should also include the user name that made the change.
 - Change inner structure of proxy's supplemental services other than UDP/TCP acceptors.
 
 ## 0.1.5 (Jun. 6, 2022)
+
 ### Improvements
 
 - Update override-list format to use individual lines for representing multiple matching for a name, i.e., (name, IPv4) and (name, IPv6).
diff --git a/README.md b/README.md
index 82546f4..639fd3a 100644
--- a/README.md
+++ b/README.md
@@ -57,8 +57,9 @@ If you run without `--config` option, i.e., simply hit `$ ./doh-auth-proxy`, the
 
 ```:toml:config.toml
 listen_addresses = ['127.0.0.1:50053', '[::1]:50053']
-bootstrap_dns = "1.1.1.1:53"
-reboot_period = 3 # mins
+bootstrap_dns = ["1.1.1.1"]
+endpoint_resolution_period = 60 # mins
+healthcheck_period = 10 # mins
 max_cache_size = 16384
 target_urls = ["https://dns.google/dns-query"]
 ```
@@ -77,7 +78,7 @@ where we assume that `config.toml` is configured as follows.
 
 ```toml:config.toml
 listen_addresses = ['127.0.0.1:50053', '[::1]:50053']
-bootstrap_dns = "8.8.8.8:53"
+bootstrap_dns = ["8.8.8.8"]
 
 target_urls = ["https://odoh.cloudflare-dns.com/dns-query"]
 
@@ -159,10 +160,14 @@ OPTIONS:
 listen_addresses = ['127.0.0.1:50053', '[::1]:50053']
 
 ## DNS (Do53) resolver address for bootstrap
-bootstrap_dns = "8.8.8.8:53"
+bootstrap_dns = ['8.8.8.8']
+
+## Minutes to re-resolve the IP addr of the nexthop and authentication endpoint url
+## Ip addresses are first resolved by bootstrap DNS, after that, they will be resolved by (MO)DoH resolver itself.
+# endpoint_resolution_period = 60
 
-## Minutes to re-fetch the IP addr of the target url host via the bootstrap DNS
-reboot_period = 3
+## Health check period in minitus. Check health of all path candidates and purge DNS cache.
+# healthcheck_period = 10
 
 ## Cache entry size (Default 16384)
 max_cache_size = 16384
@@ -240,7 +245,7 @@ odoh_relay_randomization = true
 
 You can run this proxy as a docker container, where the docker image is hosted at [Docker Hub](https://hub.docker.com/r/jqtype/doh-auth-proxy). You can run the docker container by appropriately configure env vers or an env file imported by the container.
 
-See the [`./docker/](./docker) directory and [`./docker/README.md`](./docker/README.md) for the detailed configuration for the docker container.
+See the [`./docker`](./docker) directory and [`./docker/README.md`](./docker/README.md) for the detailed configuration for the docker container.
 
 ## Authentication at the next hop node (DoH target or ODoH relay)
 
diff --git a/TODO.md b/TODO.md
index 7cf4ee1..010f977 100644
--- a/TODO.md
+++ b/TODO.md
@@ -7,10 +7,8 @@
     <https://datatracker.ietf.org/doc/html/rfc7830>
     <https://datatracker.ietf.org/doc/html/rfc8467>
 - `crates.io`
-- Sophistication of mu-ODNS based on ODoH, such as loop detection
 - Docker container packaged with token server (server-side)
 - Override with command line options over TOML configuration
 - Tweaks for anonymization
   - Override user-agent for DoH/ODoH/MODoH by specifying one in `config.toml`
 - Refactor
-- More sophisticated url building for query. Currently there exist cases of 'loop'.
diff --git a/dap-bin/src/config/target_config.rs b/dap-bin/src/config/target_config.rs
index 68d148f..26095b9 100644
--- a/dap-bin/src/config/target_config.rs
+++ b/dap-bin/src/config/target_config.rs
@@ -85,7 +85,7 @@ impl TryInto<ProxyConfig> for &TargetConfig {
 
     /////////////////////////////
     // endpoint re-resolution period
-    if let Some(val) = self.config_toml.endoint_resolution_period {
+    if let Some(val) = self.config_toml.endpoint_resolution_period {
       proxy_config.endpoint_resolution_period_sec = Duration::from_secs((val as u64) * 60);
     }
     info!(
diff --git a/dap-bin/src/config/toml.rs b/dap-bin/src/config/toml.rs
index fb116ca..0ec8150 100644
--- a/dap-bin/src/config/toml.rs
+++ b/dap-bin/src/config/toml.rs
@@ -6,7 +6,7 @@ use std::fs;
 pub struct ConfigToml {
   pub listen_addresses: Option<Vec<String>>,
   pub bootstrap_dns: Option<Vec<String>>,
-  pub endoint_resolution_period: Option<usize>,
+  pub endpoint_resolution_period: Option<usize>,
   pub healthcheck_period: Option<usize>,
   pub max_cache_size: Option<usize>,
   pub target_urls: Option<Vec<String>>,
diff --git a/docker/.env.example b/docker/.env.example
index 7f4c503..e2ab943 100644
--- a/docker/.env.example
+++ b/docker/.env.example
@@ -4,8 +4,7 @@
 # TARGET_URLS=https://dns.google/dns-query
 TARGET_URLS=https://odoh.cloudflare-dns.com/dns-query
 TARGET_RANDOMIZATION=true
-BOOTSTRAP_DNS_ADDR=1.1.1.1
-BOOTSTRAP_DNS_PORT=53
+BOOTSTRAP_DNS=1.1.1.1
 
 ## ODoH
 ## If specified, ODoH is enabled.
diff --git a/docker/Dockerfile b/docker/Dockerfile
index 83eedbf..4b22c46 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -21,7 +21,7 @@ RUN apt-get update && apt-get install -qy --no-install-recommends $BUILD_DEPS &&
     curl -sSf https://sh.rustup.rs | bash -s -- -y --default-toolchain stable && \
     export PATH="$HOME/.cargo/bin:$PATH" && \
     echo "Building DoH Auth Proxy from source" && \
-    cargo build --release --no-default-features && \
+    cargo build --release --no-default-features --package doh-auth-proxy && \
     mkdir -p /opt/doh-auth-proxy/sbin && \
     strip --strip-all /tmp/target/release/doh-auth-proxy
 
diff --git a/docker/run.sh b/docker/run.sh
index 62e0c90..8329686 100644
--- a/docker/run.sh
+++ b/docker/run.sh
@@ -2,11 +2,10 @@
 CONFIG_FILE=/modoh/doh-auth-proxy.toml
 DEFAULT_LOG_LEVEL="info"
 DEFAULT_TARGET_URLS="https://dns.google/dns-query"
-DEFAULT_BOOTSTRAP_DNS_ADDR="8.8.8.8"
-DEFAULT_BOOTSTRAP_DNS_PORT="53"
+DEFAULT_BOOTSTRAP_DNS="8.8.8.8"
 
 # bootstrap DNS
-echo "Bootstrap DNS: ${BOOTSTRAP_DNS_ADDR:-${DEFAULT_BOOTSTRAP_DNS_ADDR}}:${BOOTSTRAP_DNS_PORT:-${DEFAULT_BOOTSTRAP_DNS_PORT}}"
+echo "Bootstrap DNS: ${BOOTSTRAP_DNS:-${DEFAULT_BOOTSTRAP_DNS}}"
 
 ##########################
 # authentication and authorization
@@ -89,7 +88,7 @@ fi
 # export as a config toml file
 cat > ${CONFIG_FILE} << EOF
 listen_addresses = ["0.0.0.0:53"]
-bootstrap_dns = "${BOOTSTRAP_DNS_ADDR:-${DEFAULT_BOOTSTRAP_DNS_ADDR}}:${BOOTSTRAP_DNS_PORT:-${DEFAULT_BOOTSTRAP_DNS_PORT}}"
+bootstrap_dns = ["${BOOTSTRAP_DNS:-${DEFAULT_BOOTSTRAP_DNS}}"]
 ${TARGET_URL_STRING}
 ${TARGET_RAND_STRING}
 
diff --git a/doh-auth-proxy.toml b/doh-auth-proxy.toml
index 1a66709..c106a8c 100644
--- a/doh-auth-proxy.toml
+++ b/doh-auth-proxy.toml
@@ -17,7 +17,7 @@ bootstrap_dns = ["8.8.8.8", "1.1.1.1"]
 ## Minutes to re-resolve the IP addr of the nexthop and authentication endpoint url
 ## Ip addresses are first resolved by bootstrap DNS, after that, they will be resolved by (MO)DoH resolver itself.
 ## default is 60 minutes
-# endoint_resolution_period = 60
+# endpoint_resolution_period = 60
 
 ## Health check period in minitus. Check health of all path candidates and purge DNS cache.
 ## Default is 10 minutes.