https://github.com/corestoreio/caddy-esi

Middleware for Caddy Server integrating ESI (edge side includes) tags with parallel loading. Able to connect to HTTP/S/2, Memcache, Redis, shell scripts, gRPC and SQL backends 🐜🐜🐜
https://github.com/corestoreio/caddy-esi

caddy caddy-server caddyserver esi esi-tags grpc redis varnish webserver

Last synced: 2 months ago
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Middleware for Caddy Server integrating ESI (edge side includes) tags with parallel loading. Able to connect to HTTP/S/2, Memcache, Redis, shell scripts, gRPC and SQL backends 🐜🐜🐜

Host: GitHub
URL: https://github.com/corestoreio/caddy-esi
Owner: corestoreio
License: apache-2.0
Created: 2016-08-19T08:22:43.000Z (over 9 years ago)
Default Branch: master
Last Pushed: 2025-12-17T18:23:29.000Z (3 months ago)
Last Synced: 2026-01-13T19:55:25.130Z (2 months ago)
Topics: caddy, caddy-server, caddyserver, esi, esi-tags, grpc, redis, varnish, webserver
Language: Go
Homepage:
Size: 750 KB
Stars: 31
Watchers: 8
Forks: 8
Open Issues: 1
Metadata Files:
- Readme: README.md
- Contributing: .github/CONTRIBUTING.md
- License: LICENSE.txt

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README

# ESI Tags for Caddy Server (Alpha, WIP
)

This plugin implements partial ESI [Edge Side Includes](https://en.wikipedia.org/wiki/Edge_Side_Includes)
support for the [Caddy Webserver](https://caddyserver.com) to allow data
retrieving from heterogeneous backends aka. micro services.

### Test Users Wanted!

This plugin has the pre-beta status and we need some users who tests it with
various other middlewares on either their test server or even in production. The
plugin has been running currently for a couple of weeks on
[https://cyrillschumacher.com](https://cyrillschumacher.com/projects/2017-03-04-edge-side-includes-with-caddy/).
So far it runs smoothly. Please test it and report bugs in the issue tracker.

Thanks!

[![Build Status](https://travis-ci.org/corestoreio/caddy-esi.svg?branch=master)](https://travis-ci.org/corestoreio/caddy-esi)

#### Some features:

- Query data from HTTP, HTTPS, HTTP2, gRPC, Redis, Memcache and soon SQL.
Default implementation: HTTP/S/2.
- Multiple incoming requests trigger only one single parsing of the ESI tags per
page
- Querying multiple backend server parallel and concurrent.
- Coalesce multiple incoming requests into one single request to a backend
server
- Forwarding and returning (todo) of HTTP headers from backend servers
- Query multiple backend servers sequentially as a fall back mechanism
- Query multiple backend servers parallel and use the first returned result and
discard other responses, an obvious race condition. (todo)
- Support for NoSQL Server to query a key and simply display its value
- Variables support based on Server, Cookie, Header or GET/POST form parameters
- Error handling and fail over. Either display a text from a string or a static
file content when a backend server is unavailable.
- If an HTTP/S backend request takes longer than the specified timeout, flip the
source URL into an XHR request or an HTTP2 push. (todo)
- No full ESI support, if desired use a scripting language ;-)
- Supports Go >= 1.8

**Warning:** Project still in beta phase and to enable more backend resources
you need to buy a monthly recurring Enterprise maintenance support (Coming
soon!)

## High level overview

![Architectural overview](caddy-esi-archi.png)

As the above sequence diagram shows, the output of the initial byte starts only
then, when all data from the backend resources has been received. This enables
us to calculate the correct `Content-Length` header and also allows to return
headers from the backend to the client. So [time to first byte "TTFB"](https://en.wikipedia.org/wiki/Time_To_First_Byte)
depends on the slowest backend resource.

Future versions of CaddyESI provides the additional option of enabling
`Transfer-Encoding: chunked` to start immediately the output and then waiting
for all backend resources when the first ESI tag occurs in the page.

## Plugin configuration (optional)

```
https://cyrillschumacher.local:2718 {
...
other caddy directives
...
esi [/path_optional] {
[timeout 5ms|100us|1m|...]
[ttl 5ms|100us|1m|...]
[max_body_size 500kib|5MB|10GB|2EB|etc]
[page_id_source [host,path,ip, etc]]
[allowed_methods [GET,POST,etc]]
[cmd_header_name [X-What-Ever]]
[cache redis://localhost:6379/0]
[cache redis://localhost:6380/0]
[cache memcache://localhost:11211/2]
[cache inmemory]
[on_error (filename|"any text")]
[log_file (filename|stdout|stderr)]
[log_level (fatal|info|debug)]
[resources path/to/url_configrations.(xml|json)]
}
}
```

Most of the **global optional configuration values** can be overwritten with a
different value in a single ESI tag.

`esi` defines the namespace in the Caddy configuration file. Reserved keys are:

| Config Name | Default | Support in ESI tag | Description |
| ----------- | ------- | ----------- | ----------- |
| `[path]` | `/` | n/a | Under this path all pages gets parsed for ESI tags. Default path sets to slash. |
| `timeout` | 20s | Yes | Time when a request to a resource should be canceled. [time.Duration](https://golang.org/pkg/time/#Duration) |
| `ttl` | disabled | Yes | Time-to-live value in the NoSQL cache for data returned from the backend resources. |
| `max_body_size` | 5MB | Yes | Limits the size of the returned body from a backend resource. |
| `cache` | disabled | No | Defines a cache service which stores the retrieved data from a backend resource but only when the ttl (within an ESI tag) has been set. Can only occur multiple times! |
| `page_id_source` | `host`, `path` | No | Special directive on how to identify a request to the same page. The following settings can be used to calculate the hash value. Available settings: `remoteaddr`, `realip`, `scheme`, `host`, `path`, `rawpath`, `rawquery` and `url`. Special feature to access cookies and headers: Prefix with `cookie-` or `header-` to access the appropriate value. Attention: The more granular you define the higher possibility occurs that your RAM will be filled up (will be fixed ...). |
| `allowed_methods` | `GET` | No | Any method listed here triggers the ESI middleware |
| `cmd_header_name` | Disabled | No | Specify here a header name to enable certain commands for e.g. purging the internal ESI tag cache, setting log-level |
| `log_file` | disabled | No | Put in here either a file name or the wordings `stderr` or `stdout` to write to those file descriptors. |
| `log_level` | disabled | No | Available key words `debug` the most verbose and `info`, less verbose. |
| `log_format` | n/a | No | Not yet supported. Ideas? |
| `resources` | n/a | No | Additional configuration file in XML or JSON to refer to more backend resource services. |

`cmd_header_name` current supported values are:

- `purge` use the value `purge` with your defined `cmd_header_name` to purge the
ESI tag cache. `X-Esi-Cmd: purge`
- `log-debug` enables debug logging. Costs heavily performance.
- `log-info` enables info logging. Logs some errors and other note worthy informations.
- `log-none` disables logging.

`resources` defines the path to a configuration file for more backend resource
services. You need this file once CaddyESI has been enabled to work with other
plugins as the default HTTP implementation. An example on how the XML or JSON
must be coded:

```xml

redis01

grpc01

mysql01

mysql02
mysql01

```

```json
[
{
"alias": "redis01",
"url": "redis://127.0.0.1:6379/?db=0&max_active=10&max_idle=4"
},
{
"alias": "grpc01",
"url": "grpc://127.0.0.1:53044/?timeout=60s&tls=1&ca_file=../path/to/root.pem&server_host_override=my.domain.kom"
},
{
"alias": "mysql01",
"url": "mysql://user:password@tcp(localhost:5555)/dbname?charset=utf8mb4,utf8&tls=skip-verify",
"query": "SELECT `value` FROM tableX WHERE key='?'"
},
{
"alias": "mysql02",
"url": "mysql01",
"query": "SELECT `value` FROM tableY WHERE another_key=?"
}
]
```

Please be aware that this file must be stored securely on the hard drive and
that the owner of the Caddy process can read it. Other resource credential
loading options might be added in the future.

The resource configuration file is only needed when other services besides HTTP
are enabled.

The further usage of configuration gets explained in the ESI tag documentation.

## Supported ESI Tags and their attributes

Implemented:

- [x] Caddy configuration parsing
- [x] ESI tag parsing
- [x] ESI tag replacement
- [x] Background Fetcher workers
- [x] Basic ESI Tag
- [x] With timeout
- [ ] With ttl
- [x] Load local file after timeout for error handling
- [ ] Flip src to AJAX call or HTTP2 push after timeout
- [x] Forward all headers
- [x] Forward some headers
- [x] Forward POST,PATCH, PUT data
- [ ] Return all headers
- [ ] Return some headers
- [x] Forward QUERY STRING and/or POST form data
- [x] Multiple sources
- [ ] Multiple sources with `race="true"`
- [x] Dynamic sources/keys (string replacement)
- [ ] Conditional tag loading
- [x] Redis access
- [x] Memcache access
- [ ] MySQL access
- [ ] PGSQL access
- [ ] fCGI access
- [x] gRPC access
- [x] Shell scripts/programs access (stderr|out|in) communication
- [x] Query HTTP/S backend servers
- [x] Handle compressed content from backends (Go http.Client)
- [x] Coalesce multiple requests into one backend request

Only HTTP backend resources are enabled by default.

### TL;DR ESI tag options

Quick overview which options are available for two different kinds of ESI tags.

1. Querying an HTTP backend (default enabled)

```

2. Querying a NOSQL database or gRPC service (not enabled)

```

`key` or `src` can contain variables which gets replaced to their corresponding
values. See section "Dynamic sources and keys".

### Basic tag

The basic tag waits on the `src` until `esi.timeout` cancels the loading. If src
contains an invalid URL or has not been specified at all, nothing happens.

An unreachable `src` gets marked as "failed" in the internal cache by a circuit
breaker with an exponential back-off strategy: 2ms, 4ms, 8ms, 16ms, 32ms ... or
as defined in the `esi.timeout` or tag based `timeout` attribute.

ESI tags are getting internally cached after they have been parsed. Changes to
ESI tags during development must trigger a cache clearance via restarting or
sending the correct `cmd_header_name` header key.

A page ID defines the internal cache key for a set of ESI tags listed in an HTML
page. For each incoming request the ESI processor knows beforehand which ESI
tags to load and to process instead of parsing the HTML page sequentially. All
ESI `src` will be loaded parallel before the page output starts. Once the
content has been received the Content-Length header gets calculated and the
output starts.
TODO: Chunked transfer implementation with an immediately starting output.

```

### With timeout (optional)

The basic tag with the attribute `timeout` waits for the src until the timeout
occurs. After the timeout, the ESI tag gets not rendered and hence displays
nothing. The attribute `timeout` overwrites the default `esi.timeout`.

```

100% Support with http/s requests to backend services.

### With ttl (optional) (TODO)

The basic tag with the attribute `ttl` stores the returned data from the `src`
in the specified `esi.backend`. The attribute `ttl` overwrites the default
`esi.ttl`. If `esi.backend` has not been set or `ttl` set to empty, caching is
disabled.

`esi.backend` uses the `src` as a cache key.

```

```

### Load local file after timeout (optional)

The basic tag with the attribute `timeout` waits for the src until the timeout
occurs. After the timeout, the ESI processor loads the local file or text from
the attribute `onerror` and renders it into the page. If the file does not
exists an ugly error gets shown.

Supported file extensions: `"html", "htm", "xml", "txt", "json"`

```

### Max body size to limit the size of the body returned from a backend (optional)

The basic tag with the attribute `maxbodysize="size"` takes care that the
returned body size has been limited to the provided value. Default body size is
5 MB. Other attributes can be additionally defined.
Available size identifiers: [https://github.com/dustin/go-humanize/blob/master/bytes.go#L34](https://github.com/dustin/go-humanize/blob/master/bytes.go#L34)

```

### Flip src to AJAX call after timeout (optional) (TODO)

The basic tag with the attribute `timeout` waits for the src until the timeout
occurs. After the timeout, the ESI processor converts the URI in the `src`
attribute to an AJAX call in the frontend. The attribute `onerror="ajax"` must
exists or feature is disabled. TODO: JS code of the template ...

```

### Forward POST, PATCH or PUT data (optional)

The basic tag with the attribute `forwardpostdata` forwards all incoming request
POST, PATCH, PUT data to the `src`. Other attributes can be additionally
defined. Default value `false` which does not forward anything. POST data gets
only forwarded to those backend resources which can handle the data.

```

### Forward all headers (optional)

The basic tag with the attribute `forwardheaders` forwards all incoming request
headers to the `src`. Other attributes can be additionally defined. POST data
gets only forwarded to those backend resources which can handle the data.

```

### Forward some headers (optional)

The basic tag with the attribute `forwardheaders` forwards only the specified
headers of the incoming request to the `src`. Other attributes can be
additionally defined. POST data gets only forwarded to those backend resources
which can handle the data.

```

### Return all headers (optional) (TODO)

The basic tag with the attribute `returnheaders` returns all `src` headers to
the final response. Other attributes can be additionally defined. If duplicate
headers from multiple sources occurs, they are getting appended to the response.

```

### Return some headers (optional) (TODO)

The basic tag with the attribute `returnheaders` returns the listed headers of
the `src` to the final response. Other attributes can be additionally defined. If
duplicate headers from multiple sources occurs, they are getting appended to the
response.

```

### Coalesce multiple requests into one backend request (optional)

The basic tag with the attribute `coalesce="boolean"` takes care that for
multiple incoming requests only one backend request gets fired. Other parallel
incoming requests waits until the backend returns from the initializing request.
Any returned data from a backend resource gets shared with an unknown number of
external requests. This feature limits the pressure onto a backend resource.
Other attributes can be additionally defined. Default value `false`, hence
disabled.
`coalesce="false|true|1|0"`

```

### Printdebug (optional)

The basic tag with the attribute `printdebug="boolean"` allows to print
debugging information as an HTML comment. Debugging contains the time taken to
complete the backend request, any possible error and the raw tag itself. Be
aware that if you store sensitive information in the raw tag they will leak
towards the evil internet. Other attributes can be additionally defined. Default
value `false`, hence disabled.
`printdebug="false|true|1|0"`

```

### Multiple sources

The basic ESI tag can contain multiple sources. The ESI processor tries to load
`src` attributes in its specified order. The next `src` gets called after the
`esi.timeout` or `timeout` occurs. Other attributes can be additionally defined.
Add the attribute `race="true"` (TODO) to fire all requests at once and the one which
is the fastest gets served and the others dropped.

```

### Dynamic sources and keys (string replacement)

The basic ESI tag can extend all `src` URLs and `key` attributes with additional
parameters from the `http.Request` object. A replacement string must be one of
the listed below and must consists of the pattern: `{[^\}]+}`. Replacement
strings can occur anywhere and n-times in the `src` or `key` attribute.

```

The following string replacements are possible:

- {method}
- {scheme}
- {hostname}
- {host} (incl. port)
- {hostonly} (excl. port)
- {path} (header Caddy-Rewrite-Original-URI supported)
- {path_escaped} (header Caddy-Rewrite-Original-URI supported)
- {rewrite_path}
- {rewrite_path_escaped}
- {query}
- {query_escaped}
- {fragment}
- {proto}
- {remote} IP address, might not be the real IP address
- {real_remote} real IP address
- {port}
- {uri} the RequestURI
- {uri_escaped} the RequestURI
- {when}
- {when_iso}
- {file}
- {dir}

To access any value in the header, cookie, GET form or POST form you can write a
special crafted replacement string.

- {HMy-Header-Key-Name} must start with `H` followed by the header key name
(case in-sensitive), in this case: `My-Header-Key-Name`.
- {CMy-Cookie-Name} must start with `C` followed by the cookie name (case
sensitive), in this case: `My-Cookie-Name`.
- {FMy-Input-Name} must start with `F` followed by the name of the field (case
sensitive), in this case: `My-Input-Name`.

### Conditional tag loading (TODO)

The basic ESI tag can contain the attribute `condition`. A `condition` must
evaluate an expression to `true` to trigger the loading of the `src`.

```

### Access via src aliases

The ESI processor can access NoSQL, gRPC and SQL resources which are specified
in the Caddy resources configuration file. The `src` attribute must contain the
valid alias name as defined in resources file. The ESI tag must contain a `key`
attribute which accesses the value in the NoSQL server or forwards that value to
gRPC or uses it in the SELECT query for a database. The returned value will be
rendered unmodified into the HTML page output. You are responsible for secure
escaping of your data. If multiple `src` tags are defined the next `src` gets
used once the key cannot be found in the previous source or the `timeout`
applies. Return and forward headers might not be supported.

```

### General ESI tag attribute handling

Unrecognized attributes within an `

```

*ProTip:* Provide always the full path to the binary or script because the
lookup time in the operation systems environment PATH variable will take long.
In general shell execution is pretty slow no matter which kind of
program/script you call.

Disabled by default and must be enabled with a new compiled Caddy binary and the
build tag `esishell`.

#### SQL queries TODO

`sql` Uses a prepared statement once the ESI tag has been parsed.

```html

```

`key` will be used as parameter in the WHERE query part.

Disabled by default and must be enabled with a new compiled Caddy binary and the
build tag `esisql`.

#### gRPC Remote Procedure Calls

`grpc` queries another gRPC endpoint. A struct of arguments gets encoded and
passed over the wire.

```html

```

You are responsible for building the gRPC server. The `.proto` file and the
corresponding Go file have been placed in package `backend/esigrpc`. Your gRPC
server can run in any programming language you like and is supported by gRPC.
[https://www.grpc.io](https://www.grpc.io)

Disabled by default and must be enabled with a new compiled Caddy binary and the
build tag `esigrpc`.

## Unsupported ESI Tags

All other tags, as defined in
[https://www.w3.org/TR/esi-lang](https://www.w3.org/TR/esi-lang), won't be
supported. You should switch to a server side scripting language ;-).

# Building

The following command enables HTTP/S/2 backends:

```bash
$ go get -u github.com/caddyserver/caddy/...
# maybe checkout different version of caddy. Tested with 0.9.5
$ go get -u github.com/SchumacherDM/caddyesi/...
```

In file `$GOPATH/src/github.com/caddyserver/caddy/caddy/caddymain/run.go` add the line
`_ "github.com/corestoreio/caddy-esi"` after the text `// This is where other plugins get plugged in (imported)`.

In file `$GOPATH/src/github.com/caddyserver/caddy/caddyhttp/httpserver/plugin.go` find
the variable `directives` and add the entry `"esi",` between `hugo` and
`mailout`. At the moment I'm not quite sure if that is the correct place. If any
other middleware fails, you should change the position of the `esi` entry to
somewhere else. Please report back here by opening an issue.

Then you are ready to compile Caddy with ESI support:

```
$ GOOS=linux GOARCH=amd64 go build -o caddyesi $GOPATH/src/github.com/caddyserver/caddy/caddy/main.go
```

Change `GOOS` and `GOARCH` to whatever architecture and operating system you are targeting.

# Contribute

Send me a pull request or open an issue if you encounter a bug or something can
be improved!

Multi-time pull request senders gets collaborator access.

# Attribution

### github.com/vdobler/ht

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.

* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.

* Neither the name of ht nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

### github.com/dustin/go-humanize

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

```

### github.com/uber-go/zap

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

### github.com/bradfitz/gomemcache

Licensed under the Apache License, Version 2.0 (the "License"); you may not use
this file except in compliance with the License. You may obtain a copy of the
License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed
under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
CONDITIONS OF ANY KIND, either express or implied. See the License for the
specific language governing permissions and limitations under the License.
```

### github.com/gomodule/redigo

Licensed under the Apache License, Version 2.0 (the "License"): you may not use
this file except in compliance with the License. You may obtain a copy of the
License at

http://www.apache.org/licenses/LICENSE-2.0

### google.golang.org/grpc

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
* Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
```

# License

[Cyrill Schumacher](https://github.com/SchumacherFM) - [My pgp public key](https://www.schumacher.fm/cyrill.asc)

Licensed under the Apache License, Version 2.0 (the "License"); you may not use
this file except in compliance with the License. You may obtain a copy of the
License at

http://www.apache.org/licenses/LICENSE-2.0

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