res/values/config.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <!--
    OEMs that wish to change the below settings must do so via a runtime resource overlay package
    and *NOT* by changing this file. This file is part of the NetworkStack mainline module.
    The overlays must apply to the config_* values, not the default_* values. The default_*
    values are meant to be the default when no other configuration is specified.
    -->

    <!-- DNS probe timeout for network validation. Enough for 3 DNS queries 5 seconds apart. -->
    <integer name="default_captive_portal_dns_probe_timeout">12500</integer>

    <!-- HTTP URL for network validation, to use for detecting captive portals. -->
    <string name="default_captive_portal_http_url" translatable="false">http://connectivitycheck.gstatic.com/generate_204</string>

    <!-- HTTPS URL for network validation, to use for confirming internet connectivity. -->
    <string name="default_captive_portal_https_url" translatable="false">https://www.google.com/generate_204</string>

    <!-- List of fallback URLs to use for detecting captive portals. -->
    <string-array name="default_captive_portal_fallback_urls" translatable="false">
        <item>http://www.google.com/gen_204</item>
        <item>http://play.googleapis.com/generate_204</item>
    </string-array>

    <!-- List of fallback probe specs to use for detecting captive portals.
         This is an alternative to fallback URLs that provides more flexibility on detection rules.
         Empty, so unused by default. -->
    <string-array name="default_captive_portal_fallback_probe_specs" translatable="false">
    </string-array>

    <!-- Configuration hooks for the above settings.
         Empty by default but may be overridden by RROs. -->
    <integer name="config_captive_portal_dns_probe_timeout"></integer>
    <!--suppress CheckTagEmptyBody: overlayable resource to use as configuration hook -->
    <string name="config_captive_portal_http_url" translatable="false"></string>
    <!--suppress CheckTagEmptyBody: overlayable resource to use as configuration hook -->
    <string name="config_captive_portal_https_url" translatable="false"></string>
    <string-array name="config_captive_portal_fallback_urls" translatable="false">
    </string-array>
    <string-array name="config_captive_portal_fallback_probe_specs" translatable="false">
    </string-array>
    <string-array name="config_captive_portal_http_urls" translatable="false">
    </string-array>
    <string-array name="config_captive_portal_https_urls" translatable="false">
    </string-array>

    <!-- Customized default DNS Servers address. -->
    <string-array name="config_default_dns_servers" translatable="false">
    </string-array>
    <!-- Set to true if NetworkMonitor needs to load the resource by neighbor mcc when device
         doesn't have a SIM card inserted. -->
    <bool name="config_no_sim_card_uses_neighbor_mcc">false</bool>

    <!-- Configuration for including DHCP client hostname option -->
    <bool name="config_dhcp_client_hostname">false</bool>

    <!-- Customized neighbor unreachable probe parameters. -->
    <integer name="config_nud_steadystate_solicit_num">10</integer>
    <integer name="config_nud_steadystate_solicit_interval">750</integer>
    <integer name="config_nud_postroaming_solicit_num">5</integer>
    <integer name="config_nud_postroaming_solicit_interval">750</integer>

    <!-- Whether to force considering DNS probes returning private IP addresses as failed
         when attempting to detect captive portals.
         The impact of this feature will be evaluated separately through experiments.
         Force-enabling the feature regardless of the experiment results is not advised, as it
         could result in valid captive portals being incorrectly classified as having no
         connectivity.-->
    <bool name="config_force_dns_probe_private_ip_no_internet">false</bool>

    <!-- Define the min and max range of the content-length that should be in the HTTP response
         header of probe responses for the validation success/failed regexp to be used. The RegExp
         will be used to match the probe response content when the content-length is inside this
         interval(Strictly greater than the config_min_matches_http_content_length and strictly
         smaller than the config_max_matches_http_content_length). When the content-length is out of
         this interval, the RegExp will not be used. -->
    <integer name="config_min_matches_http_content_length">0</integer>
    <integer name="config_max_matches_http_content_length">0</integer>
    <!-- A regular expression to match the content of a network validation probe.
         Treat the network validation as failed when the content matches the
         config_network_validation_failed_content_regexp and treat the network validation as success
         when the content matches the config_network_validation_success_content_regexp. If the
         content matches both of the config_network_validation_failed_content_regexp and
         the config_network_validation_success_content_regexp, the result will be considered as
         failed. -->
    <string name="config_network_validation_failed_content_regexp" translatable="false"></string>
    <string name="config_network_validation_success_content_regexp" translatable="false"></string>
</resources>