Gradle build gets stuck after including repo and dependency about android-switch-backport HOT 3 CLOSED

Caused by: org.gradle.api.internal.externalresource.transport.http.HttpRequestEx
ception: Could not GET 'http://JRAF.org/static/maven/2/com/android/support/support-v4/'.
        at org.gradle.api.internal.externalresource.transport.http.HttpClientHel
per.performRequest(HttpClientHelper.java:80)
        at org.gradle.api.internal.externalresource.transport.http.HttpClientHel
per.performRawGet(HttpClientHelper.java:66)
        at org.gradle.api.internal.externalresource.transport.http.HttpClientHel
per.performGet(HttpClientHelper.java:70)
        at org.gradle.api.internal.externalresource.transport.http.HttpResourceA
ccessor.getResource(HttpResourceAccessor.java:46)
        at org.gradle.api.internal.externalresource.transport.http.HttpResourceL
ister.list(HttpResourceLister.java:44)
        at org.gradle.api.internal.externalresource.transport.DefaultExternalRes
ourceRepository.list(DefaultExternalResourceRepository.java:119)
        at org.gradle.api.internal.artifacts.repositories.resolver.ResourceVersi
onLister$1.listAll(ResourceVersionLister.java:145)
        at org.gradle.api.internal.artifacts.repositories.resolver.ResourceVersi
onLister$1.listRevisionToken(ResourceVersionLister.java:73)
        at org.gradle.api.internal.artifacts.repositories.resolver.ResourceVersi
onLister$1.visit(ResourceVersionLister.java:53)
        ... 215 more
Caused by: org.apache.http.conn.HttpHostConnectException: Connection to http://JRAF.org refused
        at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnect
ion(DefaultClientConnectionOperator.java:190)
        at org.apache.http.impl.conn.ManagedClientConnectionImpl.open(ManagedCli
entConnectionImpl.java:294)
        at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(Default
RequestDirector.java:640)
        at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultReq
uestDirector.java:479)
        at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpCl
ient.java:906)
        at org.apache.http.impl.client.DecompressingHttpClient.execute(Decompres
singHttpClient.java:137)
        at org.apache.http.impl.client.DecompressingHttpClient.execute(Decompres
singHttpClient.java:118)
        at org.gradle.api.internal.externalresource.transport.http.HttpClientHel
per.performHttpRequest(HttpClientHelper.java:111)
        at org.gradle.api.internal.externalresource.transport.http.HttpClientHel
per.executeGetOrHead(HttpClientHelper.java:87)
        at org.gradle.api.internal.externalresource.transport.http.HttpClientHel
per.performRequest(HttpClientHelper.java:78)
        ... 223 more
Caused by: java.net.ConnectException: Connection timed out: connect
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)
        at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
        at java.net.Socket.connect(Socket.java:529)
        at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSoc
ketFactory.java:127)
        at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnect
ion(DefaultClientConnectionOperator.java:180)
        ... 232 more