Change plugins behavior

Signed-off-by: Hadi <112569860+anotherhadi@users.noreply.github.com>

plugins/inject_header.lua

@@ -0,0 +1,28 @@
+Plugin = {
+  name        = "Inject Header",
+  description = [[
+Inject custom headers into every intercepted request.
+
+**Config**:
+- one 'Header-Name: value' per line.
+  ]],
+  on_request  = { sync = true },
+}
+
+local headers = {}
+
+function on_config(config_text)
+  headers = {}
+  for line in config_text:gmatch("[^\n]+") do
+    local name, value = line:match("^([^:]+):%s*(.+)$")
+    if name and value then
+      table.insert(headers, { name = name, value = value })
+    end
+  end
+end
+
+function on_request(req)
+  for _, h in ipairs(headers) do
+    req:set_header(h.name, h.value)
+  end
+end