diff --git a/docs/docs/usage/public-methods.md b/docs/docs/usage/public-methods.md
index d6defc60..59a85e8a 100644
--- a/docs/docs/usage/public-methods.md
+++ b/docs/docs/usage/public-methods.md
@@ -89,6 +89,19 @@ Additionally, you can clear a list of global variables by
 passing a table of variable names like so:
 `require('kulala').scripts_clear_global({'variable_name1', 'variable_name2'})`.
 
+### clear_cached_files
+
+`require('kulala').clear_cached_files()`
+clears all cached files.
+
+These files include:
+
+- last response body
+- last response headers
+- last request data
+- global variables set via scripts
+- compiled pre- and post-request scripts
+
 ### download_graphql_schema
 
 You can download the schema of a GraphQL server with:
diff --git a/lua/kulala/globals/init.lua b/lua/kulala/globals/init.lua
index 528404df..d9cf78e1 100644
--- a/lua/kulala/globals/init.lua
+++ b/lua/kulala/globals/init.lua
@@ -4,7 +4,7 @@ local M = {}
 
 local plugin_tmp_dir = FS.get_plugin_tmp_dir()
 
-M.VERSION = "4.0.3"
+M.VERSION = "4.0.4"
 M.UI_ID = "kulala://ui"
 M.SCRATCHPAD_ID = "kulala://scratchpad"
 M.HEADERS_FILE = plugin_tmp_dir .. "/headers.txt"
diff --git a/lua/kulala/init.lua b/lua/kulala/init.lua
index 05601843..7e42edf4 100644
--- a/lua/kulala/init.lua
+++ b/lua/kulala/init.lua
@@ -7,6 +7,7 @@ local JUMPS = require("kulala.jumps")
 local Graphql = require("kulala.graphql")
 local Logger = require("kulala.logger")
 local ScriptsUtils = require("kulala.parser.scripts.utils")
+local Fs = require("kulala.utils.fs")
 local M = {}
 
 M.setup = function(config)
@@ -101,4 +102,10 @@ M.set_selected_env = function(env)
   vim.g.kulala_selected_env = env
 end
 
+---Clears all cached files
+---Useful when you want to clear all cached files
+M.clear_cached_files = function()
+  Fs.clear_cached_files()
+end
+
 return M
diff --git a/lua/kulala/parser/scripts/engines/javascript/lib/src/lib/PostRequestResponse.ts b/lua/kulala/parser/scripts/engines/javascript/lib/src/lib/PostRequestResponse.ts
index f93867f3..fe683f8e 100644
--- a/lua/kulala/parser/scripts/engines/javascript/lib/src/lib/PostRequestResponse.ts
+++ b/lua/kulala/parser/scripts/engines/javascript/lib/src/lib/PostRequestResponse.ts
@@ -23,8 +23,7 @@ if (fs.existsSync(_RESPONSE_HEADERS_FILEPATH)) {
       continue;
     }
     const [key] = line.split(delimiter);
-    const lkey = key.toLowerCase();
-    headers[lkey] = {
+    headers[key] = {
       name: key,
       value: line.slice(key.length + delimiter.length).trim()
     }
@@ -44,16 +43,14 @@ export const Response = {
   body,
   headers: {
     valueOf: (headerName: string): string | null => {
-      const lkey = headerName.toLowerCase();
-      if (lkey in headers) {
-        return headers[lkey].value;
+      if (headerName in headers) {
+        return headers[headerName].value;
       }
       return null;
     },
     valuesOf: function (headerName: string): HeaderObject | null {
-      const lkey = headerName.toLowerCase();
-      if (lkey in headers) {
-        return headers[lkey];
+      if (headerName in headers) {
+        return headers[headerName];
       }
       return null;
     },
diff --git a/lua/kulala/parser/scripts/engines/javascript/lib/src/lib/PreRequestRequest.ts b/lua/kulala/parser/scripts/engines/javascript/lib/src/lib/PreRequestRequest.ts
index 13b81032..e845b3c8 100644
--- a/lua/kulala/parser/scripts/engines/javascript/lib/src/lib/PreRequestRequest.ts
+++ b/lua/kulala/parser/scripts/engines/javascript/lib/src/lib/PreRequestRequest.ts
@@ -62,14 +62,12 @@ export const Request = {
   },
   headers: {
     findByName: (headerName: string) => {
-      const hnl = headerName.toLowerCase();
-      return getHeaderObject(hnl, req.headers_raw[hnl], req.headers[hnl]);
+      return getHeaderObject(headerName, req.headers_raw[headerName], req.headers[headerName]);
     },
     all: function (): HeaderObject[] {
       const h = [];
       for (const [key, value] of Object.entries(req.headers)) {
-        const lkey = key.toLowerCase();
-        const item = getHeaderObject(lkey, req.headers_raw[lkey], value);
+        const item = getHeaderObject(key, req.headers_raw[key], value);
         if (item !== null) {
           h.push(item);
         }
diff --git a/lua/kulala/utils/fs.lua b/lua/kulala/utils/fs.lua
index 72d74a53..0796a6cb 100644
--- a/lua/kulala/utils/fs.lua
+++ b/lua/kulala/utils/fs.lua
@@ -1,3 +1,4 @@
+local Logger = require("kulala.logger")
 local M = {}
 
 ---Get the OS
@@ -198,7 +199,11 @@ M.get_request_scripts_dir = function()
   return dir
 end
 
-M.delete_files_in_directory = function(dir)
+---Delete all files in a directory
+---@param dir string
+---@param verbose boolean|nil
+---@usage fs.delete_files_in_directory('tmp', true)
+M.delete_files_in_directory = function(dir, verbose)
   -- Open the directory for scanning
   local scandir = vim.loop.fs_scandir(dir)
   if scandir then
@@ -208,13 +213,16 @@ M.delete_files_in_directory = function(dir)
       if not name then
         break
       end
-      -- Only delete files, not directories
-      if type == "file" then
+      -- Only delete files, not directories except .gitingore
+      if type == "file" and name:match(".gitignore$") == nil then
         local filepath = M.join_paths(dir, name)
         local success, err = vim.loop.fs_unlink(filepath)
         if not success then
           print("Error deleting file:", filepath, err)
         end
+        if verbose and success then
+          Logger.info("Deleted file: " .. filepath)
+        end
       end
     end
   else
@@ -316,4 +324,16 @@ M.read_file_lines = function(filename)
   return lines
 end
 
+---Clears all cached files
+M.clear_cached_files = function()
+  local tmp_dir = M.get_plugin_tmp_dir()
+  local scripts_dir = M.get_tmp_scripts_dir()
+  local request_scripts_dir = M.get_request_scripts_dir()
+  local compiled_pre_request_scripts = M.join_paths(M.get_scripts_dir(), "engines", "javascript", "lib", "dist")
+  M.delete_files_in_directory(tmp_dir, true)
+  M.delete_files_in_directory(scripts_dir, true)
+  M.delete_files_in_directory(request_scripts_dir, true)
+  M.delete_files_in_directory(compiled_pre_request_scripts, true)
+end
+
 return M