# Headerly

> Browser network rules, organized as profiles

Modify headers, redirect traffic, block requests, and target rules without changing application code.

## Table of Contents

### Start

- [Headerly overview](/start/overview.md)
- [Install Headerly](/start/installation.md)
- [Create your first profile](/start/first-profile.md)

### Guides

- [Modify request headers](/guides/modify-request-headers.md)
- [Modify response headers](/guides/modify-response-headers.md)
- [Synchronize a cookie into requests](/guides/sync-cookies.md)
- [🚧 Redirect requests](/guides/redirect-requests.md)
- [Block or allow requests](/guides/block-or-allow-requests.md)
- [Apply a profile to tabs or tab groups](/guides/apply-profile-to-tabs.md)
- [Import, export, and share profiles](/guides/import-export-share.md)

### Core reference

- [Profiles](/reference/profiles.md)
- [Profile groups](/reference/profile-groups.md)
- [Priorities](/reference/priorities.md)
- [Radio and checkbox groups](/reference/group-modes.md)

### Actions

- [Actions](/reference/actions.md)
- [Modify headers](/reference/actions/modify-headers.md)
- [Synchronize cookies](/reference/actions/sync-cookies.md)
- [Redirect](/reference/actions/redirect.md)
- [Block](/reference/actions/block.md)
- [Allow](/reference/actions/allow.md)
- [Upgrade scheme](/reference/actions/upgrade-scheme.md)
- [Allow all requests](/reference/actions/allow-all-requests.md)

### Conditions

- [Conditions](/reference/conditions.md)
- [Request domains](/reference/conditions/request-domains.md)
- [URL filter](/reference/conditions/url-filter.md)
- [Regular expression filter](/reference/conditions/regex-filter.md)
- [URL case sensitivity](/reference/conditions/url-case-sensitivity.md)
- [Initiator domains](/reference/conditions/initiator-domains.md)
- [Top-level domains](/reference/conditions/top-level-domains.md)
- [Domain type](/reference/conditions/domain-type.md)
- [Resource types](/reference/conditions/resource-types.md)
- [Request methods](/reference/conditions/request-methods.md)
- [Tab IDs](/reference/conditions/tabs.md)
- [Tab groups](/reference/conditions/tab-groups.md)

### How it works

- [How Headerly uses Declarative Net Request](/explanation/declarative-net-request.md)
- [How conditions combine](/explanation/how-conditions-combine.md)
- [Priority and conflicts](/explanation/priority-and-conflicts.md)
- [Privacy model](/explanation/privacy-model.md)

### Troubleshooting

- [Rule not applied](/troubleshooting/rule-not-applied.md)
- [Unexpected matches](/troubleshooting/unexpected-matches.md)
- [Registration errors](/troubleshooting/registration-errors.md)

### Other

- [Open shared profiles](/share.md)