Add HTTP headers

This is an example of alteration rule among many others. You can explore all rules available at Settings > Manage rules > Add a new rule.

Adding headers to requests and responses is made through adding a rule with a add request header or add response header action. You can referer to modifying traffic with rules for more information about rules.

Open rule management in one of the following ways:
- Settings menu > manage rules
- Status bar > active rule
- Ctrl+T or Cmd+T to access the search everywhere tool, then type Manage rules
Click on Add a new rule button
Search for add response header and select it (use add request header if you want to add a header to the request)

Append a response header

Fill the form with the header values
Select a filter. The specified action will only be applied to requests that match the filter. For this example, we will choose Any requests.
Save everything, now Fluxzy Desktop will append the header to any response.