diff --git a/src/agent/Cargo.lock b/src/agent/Cargo.lock
index dc1c2eae9..7711c1f3a 100644
--- a/src/agent/Cargo.lock
+++ b/src/agent/Cargo.lock
@@ -64,6 +64,23 @@ version = "0.4.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0ffd3d69bd89910509a5d31d1f1353f38ccffdd116dd0099bbd6627f7bd8ad8"
 
+[[package]]
+name = "arrayvec"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "23b62fc65de8e4e7f52534fb52b0f3ed04746ae267519eef2a83941e8085068b"
+
+[[package]]
+name = "async-channel"
+version = "1.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2114d64672151c0c5eaa5e131ec84a74f06e1e559830dabba01ca30605d66319"
+dependencies = [
+ "concurrent-queue",
+ "event-listener",
+ "futures-core",
+]
+
 [[package]]
 name = "async-trait"
 version = "0.1.50"
@@ -169,6 +186,12 @@ version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b700ce4376041dcd0a327fd0097c41095743c4c8af8887265942faf1100bd040"
 
+[[package]]
+name = "cache-padded"
+version = "1.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "631ae5198c9be5e753e5cc215e1bd73c2b466a3565173db433f52bb9d3e66dba"
+
 [[package]]
 name = "cassowary"
 version = "0.3.0"
@@ -221,6 +244,26 @@ dependencies = [
  "vec_map",
 ]
 
+[[package]]
+name = "concurrent-queue"
+version = "1.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "30ed07550be01594c6026cff2a1d7fe9c8f683caa798e12b68694ac9e88286a3"
+dependencies = [
+ "cache-padded",
+]
+
+[[package]]
+name = "config"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "19b076e143e1d9538dde65da30f8481c2a6c44040edb8e02b9bf1351edb92ce3"
+dependencies = [
+ "lazy_static",
+ "nom",
+ "serde",
+]
+
 [[package]]
 name = "core-foundation"
 version = "0.9.1"
@@ -338,6 +381,16 @@ dependencies = [
  "scopeguard",
 ]
 
+[[package]]
+name = "crossbeam-queue"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9b10ddc024425c88c2ad148c1b0fd53f4c6d38db9697c9f1588381212fa657c9"
+dependencies = [
+ "cfg-if 1.0.0",
+ "crossbeam-utils 0.8.5",
+]
+
 [[package]]
 name = "crossbeam-utils"
 version = "0.7.2"
@@ -404,6 +457,26 @@ dependencies = [
  "winapi 0.3.9",
 ]
 
+[[package]]
+name = "data-encoding"
+version = "2.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3ee2393c4a91429dffb4bedf19f4d6abf27d8a732c8ce4980305d782e5426d57"
+
+[[package]]
+name = "deadpool"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3d126179d86aee4556e54f5f3c6bf6d9884e7cc52cef82f77ee6f90a7747616d"
+dependencies = [
+ "async-trait",
+ "config",
+ "crossbeam-queue",
+ "num_cpus",
+ "serde",
+ "tokio 1.6.1",
+]
+
 [[package]]
 name = "debugger"
 version = "0.1.0"
@@ -513,12 +586,27 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "event-listener"
+version = "2.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f7531096570974c3a9dcf9e4b8e1cede1ec26cf5046219fb3b9d897503b9be59"
+
 [[package]]
 name = "fallible-iterator"
 version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4443176a9f2c162692bd3d352d745ef9413eec5782a80d8fd6f8a1ac692a07f7"
 
+[[package]]
+name = "fastrand"
+version = "1.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "77b705829d1e87f762c2df6da140b26af5839e1033aa84aa5f56bb688e4e1bdb"
+dependencies = [
+ "instant",
+]
+
 [[package]]
 name = "filetime"
 version = "0.2.14"
@@ -703,6 +791,21 @@ version = "0.3.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "acc499defb3b348f8d8f3f66415835a9131856ff7714bf10dadfc4ec4bdb29a1"
 
+[[package]]
+name = "futures-lite"
+version = "1.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7694489acd39452c77daa48516b894c153f192c3578d5a839b62c58099fcbf48"
+dependencies = [
+ "fastrand",
+ "futures-core",
+ "futures-io",
+ "memchr",
+ "parking",
+ "pin-project-lite 0.2.6",
+ "waker-fn",
+]
+
 [[package]]
 name = "futures-macro"
 version = "0.3.15"
@@ -728,6 +831,12 @@ version = "0.3.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8a16bef9fc1a4dddb5bee51c989e3fbba26569cbb0e31f5b303c184e3dd33dae"
 
+[[package]]
+name = "futures-timer"
+version = "3.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e64b03909df88034c26dc1547e8970b91f98bdb65165d6a4e9110d94263dbb2c"
+
 [[package]]
 name = "futures-util"
 version = "0.3.15"
@@ -918,6 +1027,27 @@ dependencies = [
  "pin-project-lite 0.2.6",
 ]
 
+[[package]]
+name = "http-types"
+version = "2.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ad077d89137cd3debdce53c66714dc536525ef43fe075d41ddc0a8ac11f85957"
+dependencies = [
+ "anyhow",
+ "async-channel",
+ "base64",
+ "futures-lite",
+ "http",
+ "infer",
+ "pin-project-lite 0.2.6",
+ "rand 0.7.3",
+ "serde",
+ "serde_json",
+ "serde_qs",
+ "serde_urlencoded",
+ "url",
+]
+
 [[package]]
 name = "httparse"
 version = "1.4.1"
@@ -1047,6 +1177,12 @@ dependencies = [
  "hashbrown",
 ]
 
+[[package]]
+name = "infer"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "64e9829a50b42bb782c1df523f78d332fe371b10c661e78b7a3c34b0198e9fac"
+
 [[package]]
 name = "inotify"
 version = "0.7.1"
@@ -1146,6 +1282,19 @@ version = "1.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "830d08ce1d1d941e6b30645f1a0eb5643013d835ce3779a5fc208261dbe10f55"
 
+[[package]]
+name = "lexical-core"
+version = "0.7.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6607c62aa161d23d17a9072cc5da0be67cdfc89d3afb1e8d9c842bebc2525ffe"
+dependencies = [
+ "arrayvec",
+ "bitflags",
+ "cfg-if 1.0.0",
+ "ryu",
+ "static_assertions",
+]
+
 [[package]]
 name = "libc"
 version = "0.2.95"
@@ -1402,6 +1551,17 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "nom"
+version = "5.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ffb4262d26ed83a1c0a33a38fe2bb15797329c85770da05e6b828ddb782627af"
+dependencies = [
+ "lexical-core",
+ "memchr",
+ "version_check",
+]
+
 [[package]]
 name = "notify"
 version = "4.0.17"
@@ -1651,6 +1811,12 @@ dependencies = [
  "winapi 0.3.9",
 ]
 
+[[package]]
+name = "parking"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "427c3892f9e783d91cc128285287e70a59e206ca452770ece88a76f7a3eddd72"
+
 [[package]]
 name = "parking_lot"
 version = "0.11.1"
@@ -2152,6 +2318,7 @@ dependencies = [
  "onefuzz-telemetry",
  "reqwest 0.11.3",
  "tokio 1.6.1",
+ "wiremock",
 ]
 
 [[package]]
@@ -2305,6 +2472,18 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "serde_qs"
+version = "0.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5af82de3c6549b001bec34961ff2d6a54339a87bab37ce901b693401f27de6cb"
+dependencies = [
+ "data-encoding",
+ "percent-encoding",
+ "serde",
+ "thiserror",
+]
+
 [[package]]
 name = "serde_urlencoded"
 version = "0.7.0"
@@ -2955,6 +3134,12 @@ version = "0.9.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5fecdca9a5291cc2b8dcf7dc02453fee791a280f3743cb0905f8822ae463b3fe"
 
+[[package]]
+name = "waker-fn"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9d5b2c62b4012a3e1eca5a7e077d13b3bf498c4073e33ccd58626607748ceeca"
+
 [[package]]
 name = "walkdir"
 version = "2.3.2"
@@ -3139,6 +3324,26 @@ dependencies = [
  "winapi 0.3.9",
 ]
 
+[[package]]
+name = "wiremock"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3deed3c6d9aba42c805725854efc01823f59a00cd3af7763c433962227a843c8"
+dependencies = [
+ "async-trait",
+ "deadpool",
+ "futures",
+ "futures-timer",
+ "http-types",
+ "hyper 0.14.8",
+ "log",
+ "once_cell",
+ "regex",
+ "serde",
+ "serde_json",
+ "tokio 1.6.1",
+]
+
 [[package]]
 name = "ws2_32-sys"
 version = "0.2.1"
diff --git a/src/agent/reqwest-retry/Cargo.toml b/src/agent/reqwest-retry/Cargo.toml
index 5da527e30..d8fd12425 100644
--- a/src/agent/reqwest-retry/Cargo.toml
+++ b/src/agent/reqwest-retry/Cargo.toml
@@ -15,3 +15,4 @@ reqwest = { version = "0.11.3", features = ["json", "stream"] }
 
 [dev-dependencies]
 tokio = { version = "1.5.0", features = ["macros"] }
+wiremock = "0.5"
diff --git a/src/agent/reqwest-retry/src/lib.rs b/src/agent/reqwest-retry/src/lib.rs
index 9c7c045e3..f759fec3a 100644
--- a/src/agent/reqwest-retry/src/lib.rs
+++ b/src/agent/reqwest-retry/src/lib.rs
@@ -175,6 +175,25 @@ impl SendRetry for reqwest::RequestBuilder {
 #[cfg(test)]
 mod test {
     use super::*;
+    use wiremock::matchers::path;
+    use wiremock::{Mock, MockServer, ResponseTemplate};
+
+    async fn build_server() -> Result<MockServer> {
+        let server = MockServer::start().await;
+        server
+            .register(Mock::given(path("/200")).respond_with(ResponseTemplate::new(200)))
+            .await;
+        server
+            .register(Mock::given(path("/400")).respond_with(ResponseTemplate::new(400)))
+            .await;
+        server
+            .register(Mock::given(path("/401")).respond_with(ResponseTemplate::new(401)))
+            .await;
+        server
+            .register(Mock::given(path("/404")).respond_with(ResponseTemplate::new(404)))
+            .await;
+        Ok(server)
+    }
 
     fn always_fail(_: StatusCode) -> RetryCheck {
         RetryCheck::Fail
@@ -189,8 +208,9 @@ mod test {
 
     #[tokio::test]
     async fn retry_success() -> Result<()> {
+        let server = build_server().await?;
         reqwest::Client::new()
-            .get("https://httpstat.us/200")
+            .get(format!("{}/200", &server.uri()))
             .send_retry_default()
             .await?
             .error_for_status()?;
@@ -199,15 +219,15 @@ mod test {
 
     #[tokio::test]
     async fn retry_socket_failure() -> Result<()> {
-        let invalid_url = "http://127.0.0.1:81/test.txt";
+        let server = build_server().await?;
         let resp = reqwest::Client::new()
-            .get(invalid_url)
+            .get(format!("{}/404", &server.uri()))
             .send_retry(always_retry, Duration::from_millis(1), 3)
             .await;
 
         match resp {
-            Ok(_) => {
-                anyhow::bail!("response should have failed: {}", invalid_url);
+            Ok(result) => {
+                anyhow::bail!("response should have failed: {:?}", result);
             }
             Err(err) => {
                 let as_text = format!("{:?}", err);
@@ -220,9 +240,9 @@ mod test {
 
     #[tokio::test]
     async fn retry_fail_normal() -> Result<()> {
-        let invalid_url = "https://httpstat.us/400";
+        let server = build_server().await?;
         let resp = reqwest::Client::new()
-            .get(invalid_url)
+            .get(format!("{}/400", &server.uri()))
             .send_retry(always_retry, Duration::from_millis(1), 3)
             .await;
 
@@ -241,9 +261,9 @@ mod test {
 
     #[tokio::test]
     async fn retry_fail_fast() -> Result<()> {
-        let invalid_url = "https://httpstat.us/400";
+        let server = build_server().await?;
         let resp = reqwest::Client::new()
-            .get(invalid_url)
+            .get(format!("{}/400", &server.uri()))
             .send_retry(always_fail, Duration::from_millis(1), 3)
             .await;
 
@@ -255,9 +275,9 @@ mod test {
 
     #[tokio::test]
     async fn retry_400_success() -> Result<()> {
-        let invalid_url = "https://httpstat.us/400";
+        let server = build_server().await?;
         let resp = reqwest::Client::new()
-            .get(invalid_url)
+            .get(format!("{}/400", &server.uri()))
             .send_retry(succeed_400, Duration::from_millis(1), 3)
             .await?;
 
@@ -267,9 +287,9 @@ mod test {
 
     #[tokio::test]
     async fn retry_400_with_retry() -> Result<()> {
-        let invalid_url = "https://httpstat.us/401";
+        let server = build_server().await?;
         let resp = reqwest::Client::new()
-            .get(invalid_url)
+            .get(format!("{}/401", &server.uri()))
             .send_retry(succeed_400, Duration::from_millis(1), 3)
             .await;