diff --git a/src/extractor.rs b/src/extractor.rs
index 2bcac36..7b563cb 100644
--- a/src/extractor.rs
+++ b/src/extractor.rs
@@ -7,6 +7,27 @@ use super::*;
 
 const PRAGMA: &str = "pragma circom 2.1.9;\n\n";
 
+#[derive(Debug, Deserialize)]
+pub enum ValueType {
+    #[serde(rename = "string")]
+    String,
+    #[serde(rename = "number")]
+    Number,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum Key {
+    String(String),
+    Num(i64),
+}
+
+#[derive(Debug, Deserialize)]
+pub struct Data {
+    keys: Vec<Key>,
+    value_type: ValueType,
+}
+
 fn extract_string(data: Data, circuit_buffer: &mut String) {
     *circuit_buffer += "template ExtractStringValue(DATA_BYTES, MAX_STACK_HEIGHT, ";
     for (i, key) in data.keys.iter().enumerate() {
diff --git a/src/http_lock.rs b/src/http_lock.rs
new file mode 100644
index 0000000..7bf2c24
--- /dev/null
+++ b/src/http_lock.rs
@@ -0,0 +1,34 @@
+use super::*;
+
+#[derive(Debug, Serialize, Deserialize)]
+struct HttpData {
+    request: Request,
+    response: Response,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+struct Request {
+    method: String,
+    target: String,
+    version: String,
+    headers: Vec<(String, String)>,
+    #[serde(rename = "Host")]
+    host: String,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+struct Response {
+    version: String,
+    status: String,
+    headers: Vec<(String, serde_json::Value)>,
+}
+
+// TODO: This needs to codegen a circuit now.
+pub fn http_lock(args: HttpLockArgs) -> Result<(), Box<dyn Error>> {
+    let data = std::fs::read(&args.lockfile)?;
+    let http_data: HttpData = serde_json::from_slice(&data)?;
+
+    dbg!(http_data);
+
+    Ok(())
+}
diff --git a/src/main.rs b/src/main.rs
index 1b8a79b..2312c5e 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -3,6 +3,7 @@ use serde::{Deserialize, Serialize};
 use std::{error::Error, path::PathBuf};
 
 pub mod extractor;
+pub mod http_lock;
 pub mod witness;
 
 #[derive(Parser, Debug)]
@@ -16,6 +17,7 @@ pub struct Args {
 pub enum Command {
     Witness(WitnessArgs),
     Extractor(ExtractorArgs),
+    HttpLock(HttpLockArgs),
 }
 
 #[derive(Parser, Debug)]
@@ -53,30 +55,21 @@ pub struct ExtractorArgs {
     output_filename: String,
 }
 
-#[derive(Debug, Deserialize)]
-enum ValueType {
-    #[serde(rename = "string")]
-    String,
-    #[serde(rename = "number")]
-    Number,
-}
-
-#[derive(Debug, Serialize, Deserialize)]
-#[serde(untagged)]
-enum Key {
-    String(String),
-    Num(i64),
-}
+#[derive(Parser, Debug)]
+pub struct HttpLockArgs {
+    /// Path to the JSON file
+    #[arg(long)]
+    lockfile: PathBuf,
 
-#[derive(Debug, Deserialize)]
-struct Data {
-    keys: Vec<Key>,
-    value_type: ValueType,
+    /// Output circuit file name
+    #[arg(long, default_value = "extractor")]
+    output_filename: String,
 }
 
 pub fn main() -> Result<(), Box<dyn Error>> {
     match Args::parse().command {
         Command::Extractor(args) => extractor::extractor(args),
         Command::Witness(args) => witness::witness(args),
+        Command::HttpLock(args) => http_lock::http_lock(args),
     }
 }