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<#import "/templates/guide.adoc" as tmpl>
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<#import "/templates/kc.adoc" as kc>
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<#import "/templates/links.adoc" as links>
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title="Configuring outgoing HTTP requests"
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summary="How to configure the client used for outgoing HTTP requests."
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{project_name} often needs to make requests to the applications and services that it secures. {project_name} manages these outgoing connections using an HTTP client. This {section} shows how to configure the client, connection pool, proxy environment settings, timeouts, and more.12
== Client Configuration Command
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The HTTP client that {project_name} uses for outgoing communication is highly configurable. To configure the {project_name} outgoing HTTP client, enter this command:15
<@kc.start parameters="--spi-connections-http-client-default-<configurationoption>=<value>"/>
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The following are the command options:
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*establish-connection-timeout-millis*::
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Maximum time in milliseconds until establishing a connection times out. Default: Not set.
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*socket-timeout-millis*::
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Maximum time of inactivity between two data packets until a socket connection times out, in milliseconds. Default: 5000ms
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*connection-pool-size*::
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Size of the connection pool for outgoing connections. Default: 128.
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*max-pooled-per-route*::
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How many connections can be pooled per host. Default: 64.
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*connection-ttl-millis*::
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Maximum connection time to live in milliseconds. Default: Not set.
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*max-connection-idle-time-millis*::
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Maximum time an idle connection stays in the connection pool, in milliseconds. Idle connections will be removed from the pool by a background cleaner thread. Set this option to -1 to disable this check. Default: 900000.
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Enable or disable caching of cookies. Default: true.
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File path to a Java keystore file. This keystore contains client certificates for two-way SSL.
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*client-keystore-password*::
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Password for the client keystore. REQUIRED, when `client-keystore` is set.
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*client-key-password*::
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Password for the private key of the client. REQUIRED, when client-keystore is set.
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Specify proxy configurations for outgoing HTTP requests. For more details, see <<Proxy mappings for outgoing HTTP requests>>.
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*disable-trust-manager*::
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If an outgoing request requires HTTPS and this configuration option is set to true, you do not have to specify a truststore. This setting should be used only during development and *never in production* because it will disable verification of SSL certificates. Default: false.
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== Proxy mappings for outgoing HTTP requests
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To configure outgoing requests to use a proxy, you can use the following standard proxy environment variables to configure the proxy mappings: `HTTP_PROXY`, `HTTPS_PROXY`, and `NO_PROXY`.
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* The `HTTP_PROXY` and `HTTPS_PROXY` variables represent the proxy server that is used for outgoing HTTP requests. {project_name} does not differentiate between the two variables. If you define both variables, `HTTPS_PROXY` takes precedence regardless of the actual scheme that the proxy server uses.60
* The `NO_PROXY` variable defines a comma separated list of hostnames that should not use the proxy. For each hostname that you specify, all its subdomains are also excluded from using proxy.
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The environment variables can be lowercase or uppercase. Lowercase takes precedence. For example, if you define both `HTTP_PROXY` and `http_proxy`, `http_proxy` is used.
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.Example of proxy mappings and environment variables
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HTTPS_PROXY=https://www-proxy.acme.com:8080
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NO_PROXY=google.com,login.facebook.com
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In this example, the following results occur:
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* All outgoing requests use the proxy `https://www-proxy.acme.com:8080` except for requests to google.com or any subdomain of google.com, such as auth.google.com.
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* login.facebook.com and all its subdomains do not use the defined proxy, but groups.facebook.com uses the proxy because it is not a subdomain of login.facebook.com.
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== Proxy mappings using regular expressions
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An alternative to using environment variables for proxy mappings is to configure a comma-delimited list of proxy-mappings for outgoing requests sent by {project_name}. A proxy-mapping consists of a regex-based hostname pattern and a proxy-uri, using the format `hostname-pattern;proxy-uri`.79
For example, consider the following regex:
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.*\.(google|googleapis)\.com
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You apply a regex-based hostname pattern by entering this command:
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<@kc.start parameters="--spi-connections-http-client-default-proxy-mappings=\"\'*\\\\\\.(google|googleapis)\\\\\\.com;http://www-proxy.acme.com:8080\'\""/>
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To determine the proxy for the outgoing HTTP request, the following occurs:
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* The target hostname is matched against all configured hostname patterns.
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* The proxy-uri of the first matching pattern is used.
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* If no configured pattern matches the hostname, no proxy is used.
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When your proxy server requires authentication, include the credentials of the proxy user in the format `username:password@`. For example:
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.*\.(google|googleapis)\.com;http://proxyuser:password@www-proxy.acme.com:8080
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.Example of regular expressions for proxy-mapping:
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# All requests to Google APIs use http://www-proxy.acme.com:8080 as proxy
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.*\.(google|googleapis)\.com;http://www-proxy.acme.com:8080
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# All requests to internal systems use no proxy
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.*\.acme\.com;NO_PROXY
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# All other requests use http://fallback:8080 as proxy
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.*;http://fallback:8080
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In this example, the following occurs:
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* The special value NO_PROXY for the proxy-uri is used, which means that no proxy is used for hosts matching the associated hostname pattern.
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* A catch-all pattern ends the proxy-mappings, providing a default proxy for all outgoing requests.
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== Configuring trusted certificates for TLS connections
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See <@links.server id="keycloak-truststore"/> for how
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to configure a {project_name} Truststore so that {project_name} is able to perform outgoing requests using TLS.