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+# global-agent
+
+[![GitSpo Mentions](https://gitspo.com/badges/mentions/gajus/global-agent?style=flat-square)](https://gitspo.com/mentions/gajus/global-agent)
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+
+Global HTTP/HTTPS proxy configurable using environment variables.
+
+* [Usage](#usage)
+  * [Setup proxy using `global-agent/bootstrap`](#setup-proxy-using-global-agentbootstrap)
+  * [Setup proxy using `bootstrap` routine](#setup-proxy-using-bootstrap-routine)
+  * [Runtime configuration](#runtime-configuration)
+  * [Exclude URLs](#exclude-urls)
+  * [Enable logging](#enable-logging)
+* [API](#api)
+  * [`createGlobalProxyAgent`](#createglobalproxyagent)
+  * [Environment variables](#environment-variables)
+  * [`global.GLOBAL_AGENT`](#globalglobal_agent)
+* [Supported libraries](#supported-libraries)
+* [FAQ](#faq)
+  * [What is the reason `global-agent` overrides explicitly configured HTTP(S) agent?](#what-is-the-reason-global-agent-overrides-explicitly-configured-https-agent)
+  * [What is the reason `global-agent/bootstrap` does not use `HTTP_PROXY`?](#what-is-the-reason-global-agentbootstrap-does-not-use-http_proxy)
+  * [What is the difference from `global-tunnel` and `tunnel`?](#what-is-the-difference-from-global-tunnel-and-tunnel)
+
+## Usage
+
+### Setup proxy using `global-agent/bootstrap`
+
+To configure HTTP proxy:
+
+1. Import `global-agent/bootstrap`.
+1. Export HTTP proxy address as `GLOBAL_AGENT_HTTP_PROXY` environment variable.
+
+Code:
+
+```js
+import 'global-agent/bootstrap';
+
+// or:
+// import {bootstrap} from 'global-agent';
+// bootstrap();
+
+```
+
+Bash:
+
+```bash
+$ export GLOBAL_AGENT_HTTP_PROXY=http://127.0.0.1:8080
+
+```
+
+Alternatively, you can preload module using Node.js `--require, -r` configuration, e.g.
+
+```bash
+$ export GLOBAL_AGENT_HTTP_PROXY=http://127.0.0.1:8080
+$ node -r 'global-agent/bootstrap' your-script.js
+
+```
+
+### Setup proxy using `bootstrap` routine
+
+Instead of importing a self-initialising script with side-effects as demonstrated in the [setup proxy using `global-agent/bootstrap`](#setup-proxy-using-global-agentbootstrap) documentation, you can import `bootstrap` routine and explicitly evaluate the bootstrap logic, e.g.
+
+```js
+import {
+  bootstrap
+} from 'global-agent';
+
+bootstrap();
+
+```
+
+This is useful if you need to conditionally bootstrap `global-agent`, e.g.
+
+```js
+import {
+  bootstrap
+} from 'global-agent';
+import globalTunnel from 'global-tunnel-ng';
+
+const MAJOR_NODEJS_VERSION = parseInt(process.version.slice(1).split('.')[0], 10);
+
+if (MAJOR_NODEJS_VERSION >= 10) {
+  // `global-agent` works with Node.js v10 and above.
+  bootstrap();
+} else {
+  // `global-tunnel-ng` works only with Node.js v10 and below.
+  globalTunnel.initialize();
+}
+
+```
+
+### Setup proxy using `createGlobalProxyAgent`
+
+If you do not want to use `global.GLOBAL_AGENT` variable, then you can use `createGlobalProxyAgent` to instantiate a controlled instance of `global-agent`, e.g.
+
+```js
+import {
+  createGlobalProxyAgent
+} from 'global-agent';
+
+const globalProxyAgent = createGlobalProxyAgent();
+
+```
+
+Unlike `bootstrap` routine, `createGlobalProxyAgent` factory does not create `global.GLOBAL_AGENT` variable and does not guard against multiple initializations of `global-agent`. The result object of `createGlobalProxyAgent` is equivalent to `global.GLOBAL_AGENT`.
+
+### Runtime configuration
+
+`global-agent/bootstrap` script copies `process.env.GLOBAL_AGENT_HTTP_PROXY` value to `global.GLOBAL_AGENT.HTTP_PROXY` and continues to use the latter variable.
+
+You can override the `global.GLOBAL_AGENT.HTTP_PROXY` value at runtime to change proxy behaviour, e.g.
+
+```js
+http.get('http://127.0.0.1:8000');
+
+global.GLOBAL_AGENT.HTTP_PROXY = 'http://127.0.0.1:8001';
+
+http.get('http://127.0.0.1:8000');
+
+global.GLOBAL_AGENT.HTTP_PROXY = 'http://127.0.0.1:8002';
+
+```
+
+The first HTTP request is going to use http://127.0.0.1:8001 proxy and the secord request is going to use http://127.0.0.1:8002.
+
+All `global-agent` configuration is available under `global.GLOBAL_AGENT` namespace.
+
+### Exclude URLs
+
+The `GLOBAL_AGENT_NO_PROXY` environment variable specifies a pattern of URLs that should be excluded from proxying. `GLOBAL_AGENT_NO_PROXY` value is a comma-separated list of domain names. Asterisks can be used as wildcards, e.g.
+
+```bash
+export GLOBAL_AGENT_NO_PROXY='*.foo.com,baz.com'
+
+```
+
+says to contact all machines with the 'foo.com' TLD and 'baz.com' domains directly.
+
+### Separate proxy for HTTPS
+
+The environment variable `GLOBAL_AGENT_HTTPS_PROXY` can be set to specify a separate proxy for HTTPS requests. When this variable is not set `GLOBAL_AGENT_HTTP_PROXY` is used for both HTTP and HTTPS requests.
+
+### Enable logging
+
+`global-agent` is using [`roarr`](https://www.npmjs.com/package/roarr) logger to log HTTP requests and response (HTTP status code and headers), e.g.
+
+```json
+{"context":{"program":"global-agent","namespace":"Agent","logLevel":10,"destination":"http://gajus.com","proxy":"http://127.0.0.1:8076"},"message":"proxying request","sequence":1,"time":1556269669663,"version":"1.0.0"}
+{"context":{"program":"global-agent","namespace":"Agent","logLevel":10,"headers":{"content-type":"text/plain","content-length":"2","date":"Fri, 26 Apr 2019 12:07:50 GMT","connection":"close"},"requestId":6,"statusCode":200},"message":"proxying response","sequence":2,"time":1557133856955,"version":"1.0.0"}
+
+```
+
+Export `ROARR_LOG=true` environment variable to enable log printing to stdout.
+
+Use [`roarr-cli`](https://github.com/gajus/roarr-cli) program to pretty-print the logs.
+
+## API
+
+### `createGlobalProxyAgent`
+
+```js
+/**
+ * @property environmentVariableNamespace Defines namespace of `HTTP_PROXY`, `HTTPS_PROXY` and `NO_PROXY` environment variables. (Default: `GLOBAL_AGENT_`)
+ * @property forceGlobalAgent Forces to use `global-agent` HTTP(S) agent even when request was explicitly constructed with another agent. (Default: `true`)
+ * @property socketConnectionTimeout Destroys socket if connection is not established within the timeout. (Default: `60000`)
+ */
+type ProxyAgentConfigurationInputType = {|
+  +environmentVariableNamespace?: string,
+  +forceGlobalAgent?: boolean,
+  +socketConnectionTimeout?: number,
+|};
+
+(configurationInput: ProxyAgentConfigurationInputType) => ProxyAgentConfigurationType;
+
+```
+
+### Environment variables
+
+|Name|Description|Default|
+|---|---|---|
+|`GLOBAL_AGENT_ENVIRONMENT_VARIABLE_NAMESPACE`|Defines namespace of `HTTP_PROXY`, `HTTPS_PROXY` and `NO_PROXY` environment variables.|`GLOBAL_AGENT_`|
+|`GLOBAL_AGENT_FORCE_GLOBAL_AGENT`|Forces to use `global-agent` HTTP(S) agent even when request was explicitly constructed with another agent.|`true`|
+|`GLOBAL_AGENT_SOCKET_CONNECTION_TIMEOUT`|Destroys socket if connection is not established within the timeout.|`60000`|
+|`${NAMESPACE}_HTTP_PROXY`|Sets the initial proxy controller HTTP_PROXY value.|N/A|
+|`${NAMESPACE}_HTTPS_PROXY`|Sets the initial proxy controller HTTPS_PROXY value.|N/A|
+|`${NAMESPACE}_NO_PROXY`|Sets the initial proxy controller NO_PROXY value.|N/A|
+
+### `global.GLOBAL_AGENT`
+
+`global.GLOBAL_AGENT` is initialized by `bootstrap` routine.
+
+`global.GLOBAL_AGENT` has the following properties:
+
+|Name|Description|Configurable|
+|---|---|---|
+|`HTTP_PROXY`|Yes|Sets HTTP proxy to use.|
+|`HTTPS_PROXY`|Yes|Sets a distinct proxy to use for HTTPS requests.|
+|`NO_PROXY`|Yes|Specifies a pattern of URLs that should be excluded from proxying. See [Exclude URLs](#exclude-urls).|
+
+## Supported libraries
+
+`global-agent` works with all libraries that internally use [`http.request`](https://nodejs.org/api/http.html#http_http_request_options_callback).
+
+`global-agent` has been tested to work with:
+
+* [`got`](https://www.npmjs.com/package/got)
+* [`axios`](https://www.npmjs.com/package/axios)
+* [`request`](https://www.npmjs.com/package/axios)
+
+## FAQ
+
+### What is the reason `global-agent` overrides explicitly configured HTTP(S) agent?
+
+By default, `global-agent` overrides [`agent` property](https://nodejs.org/api/http.html#http_http_request_options_callback) of any HTTP request, even if `agent` property was explicitly set when constructing a HTTP request. This behaviour allows to intercept requests of libraries that use a custom instance of an agent per default (e.g. Stripe SDK [uses an `http(s).globalAgent` instance pre-configured with `keepAlive: true`](https://github.com/stripe/stripe-node/blob/e542902dd8fbe591fe3c3ce07a7e89d1d60e4cf7/lib/StripeResource.js#L11-L12)).
+
+This behaviour can be disabled with `GLOBAL_AGENT_FORCE_GLOBAL_AGENT=false` environment variable. When disabled, then `global-agent` will only set `agent` property when it is not already defined or if `agent` is an instance of `http(s).globalAgent`.
+
+### What is the reason `global-agent/bootstrap` does not use `HTTP_PROXY`?
+
+Some libraries (e.g. [`request`](https://npmjs.org/package/request)) change their behaviour when `HTTP_PROXY` environment variable is present. Using a namespaced environment variable prevents conflicting library behaviour.
+
+You can override this behaviour by configuring `GLOBAL_AGENT_ENVIRONMENT_VARIABLE_NAMESPACE` variable, e.g.
+
+```bash
+$ export GLOBAL_AGENT_ENVIRONMENT_VARIABLE_NAMESPACE=
+
+```
+
+Now script initialized using `global-agent/bootstrap` will use `HTTP_PROXY`, `HTTPS_PROXY` and `NO_PROXY` environment variables.
+
+### What is the difference from `global-tunnel` and `tunnel`?
+
+[`global-tunnel`](https://github.com/salesforce/global-tunnel) (including [`global-tunnel-ng`](https://github.com/np-maintain/global-tunnel) and [`tunnel`](https://npmjs.com/package/tunnel)) are designed to support legacy Node.js versions. They use various [workarounds](https://github.com/koichik/node-tunnel/blob/5fb2fb424788597146b7be6729006cad1cf9e9a8/lib/tunnel.js#L134-L144) and rely on [monkey-patching `http.request`, `http.get`, `https.request` and `https.get` methods](https://github.com/np-maintain/global-tunnel/blob/51413dcf0534252b5049ec213105c7063ccc6367/index.js#L302-L338).
+
+In contrast, `global-agent` supports Node.js v10 and above, and does not implements workarounds for the older Node.js versions.