diff --git a/lib/user_agent.rb b/lib/user_agent.rb
index 9b3c79466..6f3fa0eef 100644
--- a/lib/user_agent.rb
+++ b/lib/user_agent.rb
@@ -48,7 +48,10 @@ returns
     http = get_http(uri, options)
 
     # prepare request
-    request = Net::HTTP::Get.new(uri, { 'User-Agent' => 'Zammad User Agent' })
+    request = Net::HTTP::Get.new(uri)
+
+    # set headers
+    request = set_headers(request, options)
 
     # http basic auth (if needed)
     request = set_basic_auth(request, options)
@@ -104,7 +107,10 @@ returns
     http = get_http(uri, options)
 
     # prepare request
-    request = Net::HTTP::Post.new(uri, { 'User-Agent' => 'Zammad User Agent' })
+    request = Net::HTTP::Post.new(uri)
+
+    # set headers
+    request = set_headers(request, options)
 
     # set params
     request = set_params(request, params, options)
@@ -159,7 +165,10 @@ returns
     http = get_http(uri, options)
 
     # prepare request
-    request = Net::HTTP::Put.new(uri, { 'User-Agent' => 'Zammad User Agent' })
+    request = Net::HTTP::Put.new(uri)
+
+    # set headers
+    request = set_headers(request, options)
 
     # set params
     request = set_params(request, params, options)
@@ -210,7 +219,10 @@ returns
     http = get_http(uri, options)
 
     # prepare request
-    request = Net::HTTP::Delete.new(uri, { 'User-Agent' => 'Zammad User Agent' })
+    request = Net::HTTP::Delete.new(uri)
+
+    # set headers
+    request = set_headers(request, options)
 
     # http basic auth (if needed)
     request = set_basic_auth(request, options)
@@ -334,6 +346,17 @@ returns
     request
   end
 
+  def self.set_headers(request, options)
+    defaults = { 'User-Agent' => 'Zammad User Agent' }
+    headers  = defaults.merge(options.fetch(:headers, {}))
+
+    headers.each do |header, value|
+      request[header] = value
+    end
+
+    request
+  end
+
   def self.log(url, request, response, options)
     return if !options[:log]