# About Angie Angie /[andʒi](https://en.wikipedia.org/wiki/International_Phonetic_Alphabet)/ is an efficient, powerful, and scalable web server that was forked from nginx: * Conceived by ex-devs from the original team to venture beyond the earlier vision and act as a [drop-in replacement](https://en.angie.software//angie/docs/configuration/migration.md#migration) without major changes to module setup or configuration. * Includes most capabilities of [nginx |nginxversion|](https://nginx.org/en/CHANGES) and a number of [new features](#index-features-oss). We build binary packages for a range of [systems and architectures](https://en.angie.software//angie/docs/installation/index.md#install-packages), as well as [Docker images](https://en.angie.software//angie/docs/installation/docker.md#docker-images). The source code is open in our [public repositories](https://en.angie.software//angie/docs/development.md#development) under a [BSD-like license](https://en.angie.software//angie/license-angie.md#license-angie). Also, a commercial version with [additional features](#index-features-pro) is marketed as Angie PRO. A choice of ready-made Angie packages, Docker images, and source code build options. Startup and run-time control; configuration, modules, directives, and variables. Resolving technical issues with Angie, available feedback routes. Information for developers who want to contribute to the project. ## Current Version **Angie |angie_version|** and **Angie PRO |angie_pro_version|** were released on **|angie_release_date|**. New versions appear quarterly; in between, we publish urgent fixes and important updates. See also the complete version history for [Angie](https://en.angie.software//angie/docs/oss_changes.md#oss-changes) and [Angie PRO](https://en.angie.software//angie/docs/pro_changes.md#pro-changes). ## Features Core advantages over nginx, available in the free open-source version of Angie: - Supporting [HTTP/3](https://en.angie.software//angie/docs/configuration/modules/http/http_v3.md#http-v3) for client connections, as well as for [proxied server](https://en.angie.software//angie/docs/configuration/modules/http/http_proxy.md#proxy-http-version) connections, with the ability to independently use different protocol versions (HTTP/1.x, HTTP/2, HTTP/3) on opposite sides. - Automatic HTTPS provisions TLS certificates using built-in [ACME](https://en.angie.software//angie/docs/configuration/modules/http/http_acme.md#id1) protocol support. - Simplifying configuration: the `location` directive can define several matching expressions at once, which enables [combining](https://en.angie.software//angie/docs/configuration/modules/http/index.md#combined-locations) blocks with shared settings. - Exposing basic information about the web server, its [configuration](https://en.angie.software//angie/docs/configuration/modules/http/http_api.md#a-api-config-files), as well as [metrics](https://en.angie.software//angie/docs/configuration/modules/http/http_api.md#metrics) of proxied servers, client connections, shared memory zones, and many other things via a RESTful [API](https://en.angie.software//angie/docs/configuration/modules/http/http_api.md#a-api) interface in JSON format. - Exporting statistics in [Prometheus](https://en.angie.software//angie/docs/configuration/modules/http/http_prometheus.md#id1) format with [customizable templates](https://en.angie.software//angie/docs/configuration/modules/http/http_prometheus.md#prometheus-template). - Monitoring the server through the browser with the [Console Light](https://en.angie.software//angie/docs/configuration/monitoring.md#monitoring) visual monitoring tool. See the online demo: [https://console.angie.software/](https://console.angie.software/) - Dynamic updating of upstream groups based on events and labels from [Docker containers](https://en.angie.software//angie/docs/configuration/modules/http/http_docker.md#http-docker) (or similar tools like Podman) without server reload. - Flushing the shared memory zone in [proxy_cache_path](https://en.angie.software//angie/docs/configuration/modules/http/http_proxy.md#proxy-cache-path) to disk preserves the cache index contents between restarts and updates, which eliminates the cache load delay and brings the server online even faster. - [Session binding](https://en.angie.software//angie/docs/configuration/modules/http/http_upstream.md#u-sticky) mode, which directs all requests within one session to the same proxied server. - Recommissioning upstream servers after a failure smoothly using the `slow_start` option of the [server](https://en.angie.software//angie/docs/configuration/modules/http/http_upstream.md#u-server) directive. - Limiting the [MP4 file transfer rate](https://en.angie.software//angie/docs/configuration/modules/http/http_mp4.md#mp4-limit-rate) proportionally to its bitrate, thus reducing the bandwidth load. - Extending authorization and balancing capabilities for the MQTT protocol with the [mqtt_preread](https://en.angie.software//angie/docs/configuration/modules/stream/stream_mqtt_preread.md#s-mqtt-preread) directive under `stream`. - Informing balancing decisions with RDP protocol's session cookies via the [rdp_preread](https://en.angie.software//angie/docs/configuration/modules/stream/stream_rdp_preread.md#s-rdp-preread) directive under `stream`. - [Server](https://en.angie.software//angie/docs/configuration/modules/http/http_ssl.md#ssl-ntls)- and [client-side](https://en.angie.software//angie/docs/configuration/modules/http/http_proxy.md#proxy-ssl-ntls) support for NTLS when using the [TongSuo](https://github.com/Tongsuo-Project/Tongsuo) TLS library, enabled [at build time](https://en.angie.software//angie/docs/installation/sourcebuild.md#install-source-features). - Pre-built [binary packages](https://en.angie.software//angie/docs/installation/external-modules/index.md#install-thirdpartymodules) for many popular third-party modules. --- Commercial Angie PRO adds the following to the [publicly available features](#index-features-oss): - Managing of proxied servers through a RESTful dynamic configuration [API](https://en.angie.software//angie/docs/configuration/modules/http/http_api.md#api-config); the visual monitoring console [Console Light](https://en.angie.software//angie/docs/configuration/monitoring.md#monitoring) can also be used to manage the server in your browser. - Proactively checking the state of proxied servers by sending periodic [probing requests](https://en.angie.software//angie/docs/configuration/modules/http/http_upstream_probe.md#u-upstream-probe). - Load balancing based on [average response time](https://en.angie.software//angie/docs/configuration/modules/http/http_upstream.md#u-least-time) from proxied servers with [customizable smoothing factor](https://en.angie.software//angie/docs/configuration/modules/http/http_upstream.md#u-response-time-factor). - [Feedback-based](https://en.angie.software//angie/docs/configuration/modules/http/http_upstream.md#u-feedback) load balancing that selects peers based on a variable value; supposedly, it comes from the peers themselves, reporting their CPU load or other metrics. - Waiting queue for requests, configured using the [queue](https://en.angie.software//angie/docs/configuration/modules/http/http_upstream.md#u-queue) directive in the `upstream` block. - Additional binding mode [sticky learn](https://en.angie.software//angie/docs/configuration/modules/http/http_upstream.md#u-sticky), enabling detection and storage of client sessions in shared memory or external storage, which allows joining multiple balancers in a cluster. - Using the [backup_switch](https://en.angie.software//angie/docs/configuration/modules/http/http_upstream.md#u-backup-switch) directive in the `upstream` block of the HTTP module allows backup servers to continue serving requests when the primary servers become accessible again. - Conditional [binding of client connections](https://en.angie.software//angie/docs/configuration/modules/http/http_upstream.md#u-bind-conn) to the proxied server connection, which also enables proxying NTLM. - Cache sharding in the proxy module, which enables distributing it between [locations](https://en.angie.software//angie/docs/configuration/modules/http/http_proxy.md#proxy-cache) depending on the properties of the response. - Server signature on error pages and in the `Server` header field can be hidden or overridden with the [server_tokens](https://en.angie.software//angie/docs/configuration/modules/http/index.md#server-tokens) directive.