The following stack trace of warnings with java exit happens when trying to archive my android project. Why is Proguard not finding the below mentioned classes?
2>PROGUARD : warning : com.google.android.gms.internal.zzal: can't find superclass or interface org.apache.http.client.methods.HttpEntityEnclosingRequestBase
2>PROGUARD : warning : com.google.android.gms.internal.zzad: can't find referenced class org.apache.http.Header
2>PROGUARD : warning : com.google.android.gms.internal.zzad: can't find referenced class org.apache.http.Header
2>PROGUARD : warning : com.google.android.gms.internal.zzad: can't find referenced class org.apache.http.HttpEntity
2>PROGUARD : warning : com.google.android.gms.internal.zzad: can't find referenced class org.apache.http.HttpResponse
2>PROGUARD : warning : com.google.android.gms.internal.zzad: can't find referenced class org.apache.http.StatusLine
2>PROGUARD : warning : com.google.android.gms.internal.zzad: can't find referenced class org.apache.http.impl.cookie.DateUtils
2>PROGUARD : warning : com.google.android.gms.internal.zzad: can't find referenced class org.apache.http.impl.cookie.DateUtils
2>PROGUARD : warning : com.google.android.gms.internal.zzad: can't find referenced class org.apache.http.Header
2>PROGUARD : warning : com.google.android.gms.internal.zzad: can't find referenced class org.apache.http.Header
2>PROGUARD : warning : com.google.android.gms.internal.zzad: can't find referenced class org.apache.http.HttpEntity
2>PROGUARD : warning : com.google.android.gms.internal.zzad: can't find referenced class org.apache.http.HttpEntity
2>PROGUARD : warning : com.google.android.gms.internal.zzad: can't find referenced class org.apache.http.HttpEntity
2>PROGUARD : warning : com.google.android.gms.internal.zzad: can't find referenced class org.apache.http.HttpResponse
2>PROGUARD : warning : com.google.android.gms.internal.zzad: can't find referenced class org.apache.http.HttpResponse
2>PROGUARD : warning : com.google.android.gms.internal.zzad: can't find referenced class org.apache.http.HttpResponse
2>PROGUARD : warning : com.google.android.gms.internal.zzad: can't find referenced class org.apache.http.StatusLine
2>PROGUARD : warning : com.google.android.gms.internal.zzad: can't find referenced class org.apache.http.HttpEntity
2>PROGUARD : warning : com.google.android.gms.internal.zzad: can't find referenced class org.apache.http.Header
2>PROGUARD : warning : com.google.android.gms.internal.zzad: can't find referenced class org.apache.http.Header
2>PROGUARD : warning : com.google.android.gms.internal.zzak: can't find referenced class org.apache.http.client.HttpClient
2>PROGUARD : warning : com.google.android.gms.internal.zzak: can't find referenced class org.apache.http.client.methods.HttpDelete
2>PROGUARD : warning : com.google.android.gms.internal.zzak: can't find referenced class org.apache.http.client.methods.HttpEntityEnclosingRequestBase
2>PROGUARD : warning : com.google.android.gms.internal.zzak: can't find referenced class org.apache.http.client.methods.HttpGet
2>PROGUARD : warning : com.google.android.gms.internal.zzak: can't find referenced class org.apache.http.client.methods.HttpHead
2>PROGUARD : warning : com.google.android.gms.internal.zzak: can't find referenced class org.apache.http.client.methods.HttpOptions
2>PROGUARD : warning : com.google.android.gms.internal.zzak: can't find referenced class org.apache.http.client.methods.HttpPost
2>PROGUARD : warning : com.google.android.gms.internal.zzak: can't find referenced class org.apache.http.client.methods.HttpPut
2>PROGUARD : warning : com.google.android.gms.internal.zzak: can't find referenced class org.apache.http.client.methods.HttpRequestBase
2>PROGUARD : warning : com.google.android.gms.internal.zzak: can't find referenced class org.apache.http.client.methods.HttpTrace
2>PROGUARD : warning : com.google.android.gms.internal.zzak: can't find referenced class org.apache.http.client.methods.HttpUriRequest
2>PROGUARD : warning : com.google.android.gms.internal.zzak: can't find referenced class org.apache.http.entity.ByteArrayEntity
2>PROGUARD : warning : com.google.android.gms.internal.zzak: can't find referenced method 'void addHeader(java.lang.String,java.lang.String)' in program class com.google.android.gms.internal.zzal
2>PROGUARD : warning : com.google.android.gms.internal.zzak: can't find referenced class org.apache.http.client.methods.HttpDelete
2>PROGUARD : warning : com.google.android.gms.internal.zzak: can't find referenced class org.apache.http.client.methods.HttpEntityEnclosingRequestBase
2>PROGUARD : warning : com.google.android.gms.internal.zzak: can't find referenced class org.apache.http.client.methods.HttpGet
2>PROGUARD : warning : com.google.android.gms.internal.zzak: can't find referenced class org.apache.http.client.methods.HttpHead
2>PROGUARD : warning : com.google.android.gms.internal.zzak: can't find referenced class org.apache.http.client.methods.HttpOptions
2>PROGUARD : warning : com.google.android.gms.internal.zzak: can't find referenced class org.apache.http.client.methods.HttpPost
2>PROGUARD : warning : com.google.android.gms.internal.zzak: can't find referenced class org.apache.http.client.methods.HttpPost
2>PROGUARD : warning : com.google.android.gms.internal.zzak: can't find referenced class org.apache.http.client.methods.HttpPut
2>PROGUARD : warning : com.google.android.gms.internal.zzak: can't find referenced class org.apache.http.client.methods.HttpPut
2>PROGUARD : warning : com.google.android.gms.internal.zzak: can't find referenced class org.apache.http.client.methods.HttpTrace
2>PROGUARD : warning : com.google.android.gms.internal.zzak: can't find referenced class org.apache.http.entity.ByteArrayEntity
2>PROGUARD : warning : com.google.android.gms.internal.zzak: can't find referenced class org.apache.http.client.HttpClient
2>PROGUARD : warning : com.google.android.gms.internal.zzak: can't find referenced class org.apache.http.client.methods.HttpUriRequest
2>PROGUARD : warning : com.google.android.gms.internal.zzak: can't find referenced class org.apache.http.client.methods.HttpUriRequest
2>PROGUARD : warning : com.google.android.gms.internal.zzak: can't find referenced class org.apache.http.client.HttpClient
2>PROGUARD : warning : com.google.android.gms.internal.zzak: can't find referenced class org.apache.http.client.HttpClient
2>PROGUARD : warning : com.google.android.gms.internal.zzak: can't find referenced class org.apache.http.client.methods.HttpUriRequest
2>PROGUARD : warning : com.google.android.gms.internal.zzak: can't find referenced class org.apache.http.client.methods.HttpUriRequest
2>PROGUARD : warning : com.google.android.gms.internal.zzak: can't find referenced class org.apache.http.HttpResponse
2>PROGUARD : warning : com.google.android.gms.internal.zzak: can't find referenced class org.apache.http.HttpResponse
2>PROGUARD : warning : com.google.android.gms.internal.zzak: can't find referenced class org.apache.http.client.methods.HttpEntityEnclosingRequestBase
2>PROGUARD : warning : com.google.android.gms.internal.zzak: can't find referenced class org.apache.http.client.methods.HttpEntityEnclosingRequestBase
2>PROGUARD : warning : com.google.android.gms.internal.zzal: can't find referenced class org.apache.http.client.methods.HttpEntityEnclosingRequestBase
2>PROGUARD : warning : com.google.android.gms.internal.zzal: can't find referenced method 'void setURI(java.net.URI)' in program class com.google.android.gms.internal.zzal
2>PROGUARD : warning : com.google.android.gms.internal.zzal: can't find referenced class org.apache.http.client.methods.HttpEntityEnclosingRequestBase
2>PROGUARD : warning : com.google.android.gms.internal.zzam: can't find referenced class org.apache.http.impl.cookie.DateParseException
2>PROGUARD : warning : com.google.android.gms.internal.zzam: can't find referenced class org.apache.http.impl.cookie.DateUtils
2>PROGUARD : warning : com.google.android.gms.internal.zzam: can't find referenced class org.apache.http.impl.cookie.DateUtils
2>PROGUARD : warning : com.google.android.gms.internal.zzan: can't find referenced class org.apache.http.HttpResponse
2>PROGUARD : warning : com.google.android.gms.internal.zzan: can't find referenced class org.apache.http.HttpResponse
2>PROGUARD : warning : com.google.android.gms.internal.zzao: can't find referenced class org.apache.http.ProtocolVersion
2>PROGUARD : warning : com.google.android.gms.internal.zzao: can't find referenced class org.apache.http.StatusLine
2>PROGUARD : warning : com.google.android.gms.internal.zzao: can't find referenced class org.apache.http.entity.BasicHttpEntity
2>PROGUARD : warning : com.google.android.gms.internal.zzao: can't find referenced class org.apache.http.message.BasicHeader
2>PROGUARD : warning : com.google.android.gms.internal.zzao: can't find referenced class org.apache.http.message.BasicHttpResponse
2>PROGUARD : warning : com.google.android.gms.internal.zzao: can't find referenced class org.apache.http.message.BasicStatusLine
2>PROGUARD : warning : com.google.android.gms.internal.zzao: can't find referenced class org.apache.http.ProtocolVersion
2>PROGUARD : warning : com.google.android.gms.internal.zzao: can't find referenced class org.apache.http.entity.BasicHttpEntity
2>PROGUARD : warning : com.google.android.gms.internal.zzao: can't find referenced class org.apache.http.entity.BasicHttpEntity
2>PROGUARD : warning : com.google.android.gms.internal.zzao: can't find referenced class org.apache.http.entity.BasicHttpEntity
2>PROGUARD : warning : com.google.android.gms.internal.zzao: can't find referenced class org.apache.http.entity.BasicHttpEntity
2>PROGUARD : warning : com.google.android.gms.internal.zzao: can't find referenced class org.apache.http.entity.BasicHttpEntity
2>PROGUARD : warning : com.google.android.gms.internal.zzao: can't find referenced class org.apache.http.message.BasicHeader
2>PROGUARD : warning : com.google.android.gms.internal.zzao: can't find referenced class org.apache.http.message.BasicHttpResponse
2>PROGUARD : warning : com.google.android.gms.internal.zzao: can't find referenced class org.apache.http.message.BasicHttpResponse
2>PROGUARD : warning : com.google.android.gms.internal.zzao: can't find referenced class org.apache.http.message.BasicHttpResponse
2>PROGUARD : warning : com.google.android.gms.internal.zzao: can't find referenced class org.apache.http.message.BasicStatusLine
2>PROGUARD : warning : com.google.android.gms.internal.zzao: can't find referenced class org.apache.http.StatusLine
2>PROGUARD : warning : com.google.android.gms.internal.zzao: can't find referenced class org.apache.http.HttpResponse
2>PROGUARD : warning : com.google.android.gms.internal.zzao: can't find referenced class org.apache.http.HttpResponse
2>PROGUARD : warning : com.google.android.gms.internal.zzao: can't find referenced class org.apache.http.HttpEntity
2>PROGUARD : warning : com.google.android.gms.internal.zzas: can't find referenced class android.net.http.AndroidHttpClient
2>PROGUARD : warning : com.google.android.gms.internal.zzas: can't find referenced class android.net.http.AndroidHttpClient
2>PROGUARD : warning : there were 84 unresolved references to classes or interfaces.
2>PROGUARD : warning : there were 2 unresolved references to program class members.
Added with it is the usage of Http package.
Package 'Microsoft.Bcl 1.1.10' was restored using '.NETFramework,Version=v4.6.1' instead of the project target framework '.NETStandard,Version=v2.0'. This package may not be fully compatible with your project.
Package 'Microsoft.Net.Http 2.2.29' was restored using '.NETFramework,Version=v4.6.1' instead of the project target framework '.NETStandard,Version=v2.0'. This package may not be fully compatible with your project.
How is the Http package referencing to target framework .NET framework 4.6.1, even when I install the package from a .NET standard project?