diff --git a/docs/middleware/request/authentication.md b/docs/middleware/request/authentication.md
index 3342f1fb5..70da6e317 100644
--- a/docs/middleware/request/authentication.md
+++ b/docs/middleware/request/authentication.md
@@ -10,12 +10,7 @@ top_link: ./list
 ---
 
 The `Faraday::Request::Authorization` middleware allows you to automatically add an `Authorization` header
-to your requests. It also features 2 specialised sub-classes that provide useful extra features for Basic Authentication
-and Token Authentication requests.
-
-### Any Authentication
-
-The generic `Authorization` middleware allows you to add any type of Authorization header.
+to your requests. It also features a handy helper to manage Basic authentication.
 
 ```ruby
 Faraday.new(...) do |conn|
@@ -23,24 +18,22 @@ Faraday.new(...) do |conn|
 end
 ```
 
-### Basic Authentication
+### With a proc
 
-`BasicAuthentication` adds a 'Basic' type Authorization header to a Faraday request.
+You can also provide a proc, which will be evaluated on each request:
 
 ```ruby
 Faraday.new(...) do |conn|
-  conn.request :basic_auth, 'username', 'password'
+  conn.request :authorization, 'Bearer', -> { MyAuthStorage.get_auth_token }
 end
 ```
 
-### Token Authentication
+### Basic Authentication
 
-`TokenAuthentication` adds a 'Token' type Authorization header to a Faraday request.
-You can optionally provide a hash of `options` that will be appended to the token.
-This is not used anymore in modern web and have been replaced by Bearer tokens.
+The middleware will automatically Base64 encode your Basic username and password:
 
 ```ruby
 Faraday.new(...) do |conn|
-  conn.request :token_auth, 'authentication-token', **options
+  conn.request :authorization, :basic, 'username', 'password'
 end
 ```
diff --git a/lib/faraday/connection.rb b/lib/faraday/connection.rb
index 6344f6a0c..1b035677b 100644
--- a/lib/faraday/connection.rb
+++ b/lib/faraday/connection.rb
@@ -283,77 +283,6 @@ def #{method}(url = nil, body = nil, headers = nil, &block)
       RUBY
     end
 
-    # Sets up the Authorization header with these credentials, encoded
-    # with base64.
-    #
-    # @param login [String] The authentication login.
-    # @param pass [String] The authentication password.
-    #
-    # @example
-    #
-    #   conn.basic_auth 'Aladdin', 'open sesame'
-    #   conn.headers['Authorization']
-    #   # => "Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ=="
-    #
-    # @return [void]
-    def basic_auth(login, pass)
-      warn <<~TEXT
-        WARNING: `Faraday::Connection#basic_auth` is deprecated; it will be removed in version 2.0.
-        While initializing your connection, use `#request(:basic_auth, ...)` instead.
-        See https://lostisland.github.io/faraday/middleware/authentication for more usage info.
-      TEXT
-      set_authorization_header(:basic_auth, login, pass)
-    end
-
-    # Sets up the Authorization header with the given token.
-    #
-    # @param token [String]
-    # @param options [Hash] extra token options.
-    #
-    # @example
-    #
-    #   conn.token_auth 'abcdef', foo: 'bar'
-    #   conn.headers['Authorization']
-    #   # => "Token token=\"abcdef\",
-    #               foo=\"bar\""
-    #
-    # @return [void]
-    def token_auth(token, options = nil)
-      warn <<~TEXT
-        WARNING: `Faraday::Connection#token_auth` is deprecated; it will be removed in version 2.0.
-        While initializing your connection, use `#request(:token_auth, ...)` instead.
-        See https://lostisland.github.io/faraday/middleware/authentication for more usage info.
-      TEXT
-      set_authorization_header(:token_auth, token, options)
-    end
-
-    # Sets up a custom Authorization header.
-    #
-    # @param type [String] authorization type
-    # @param token [String, Hash] token. A String value is taken literally, and
-    #         a Hash is encoded into comma-separated key/value pairs.
-    #
-    # @example
-    #
-    #   conn.authorization :Bearer, 'mF_9.B5f-4.1JqM'
-    #   conn.headers['Authorization']
-    #   # => "Bearer mF_9.B5f-4.1JqM"
-    #
-    #   conn.authorization :Token, token: 'abcdef', foo: 'bar'
-    #   conn.headers['Authorization']
-    #   # => "Token token=\"abcdef\",
-    #               foo=\"bar\""
-    #
-    # @return [void]
-    def authorization(type, token)
-      warn <<~TEXT
-        WARNING: `Faraday::Connection#authorization` is deprecated; it will be removed in version 2.0.
-        While initializing your connection, use `#request(:authorization, ...)` instead.
-        See https://lostisland.github.io/faraday/middleware/authentication for more usage info.
-      TEXT
-      set_authorization_header(:authorization, type, token)
-    end
-
     # Check if the adapter is parallel-capable.
     #
     # @yield if the adapter isn't parallel-capable, or if no adapter is set yet.
@@ -579,14 +508,6 @@ def with_uri_credentials(uri)
       yield(Utils.unescape(uri.user), Utils.unescape(uri.password))
     end
 
-    def set_authorization_header(header_type, *args)
-      header = Faraday::Request
-               .lookup_middleware(header_type)
-               .header(*args)
-
-      headers[Faraday::Request::Authorization::KEY] = header
-    end
-
     def proxy_from_env(url)
       return if Faraday.ignore_env_proxy
 
diff --git a/lib/faraday/request/authorization.rb b/lib/faraday/request/authorization.rb
index f9b56c871..d6aeaf2f7 100644
--- a/lib/faraday/request/authorization.rb
+++ b/lib/faraday/request/authorization.rb
@@ -1,5 +1,7 @@
 # frozen_string_literal: true
 
+require 'base64'
+
 module Faraday
   class Request
     # Request middleware for the Authorization HTTP header
@@ -8,47 +10,46 @@ class Authorization < Faraday::Middleware
         KEY = 'Authorization'
       end
 
-      # @param type [String, Symbol]
-      # @param token [String, Symbol, Hash]
-      # @return [String] a header value
-      def self.header(type, token)
-        case token
-        when String, Symbol
-          "#{type} #{token}"
-        when Hash
-          build_hash(type.to_s, token)
-        else
-          raise ArgumentError,
-                "Can't build an Authorization #{type}" \
-                  "header from #{token.inspect}"
-        end
-      end
-
-      # @param type [String]
-      # @param hash [Hash]
-      # @return [String] type followed by comma-separated key=value pairs
-      # @api private
-      def self.build_hash(type, hash)
-        comma = ', '
-        values = []
-        hash.each do |key, value|
-          values << "#{key}=#{value.to_s.inspect}"
-        end
-        "#{type} #{values * comma}"
-      end
-
       # @param app [#call]
       # @param type [String, Symbol] Type of Authorization
-      # @param token [String, Symbol, Hash] Token value for the Authorization
-      def initialize(app, type, token)
-        @header_value = self.class.header(type, token)
+      # @param params [Array<String, Proc>] parameters to build the Authorization header.
+      #   If the type is `:basic`, then these can be a login and password pair.
+      #   Otherwise, a single value is expected that will be appended after the type.
+      #   This value can be a proc, in which case it will be invoked on each request.
+      def initialize(app, type, *params)
+        @type = type
+        @params = params
         super(app)
       end
 
       # @param env [Faraday::Env]
-      def call(env)
-        env.request_headers[KEY] = @header_value unless env.request_headers[KEY]
-        @app.call(env)
+      def on_request(env)
+        return if env.request_headers[KEY]
+
+        env.request_headers[KEY] = header_from(@type, *@params)
+      end
+
+      private
+
+      # @param type [String, Symbol]
+      # @param params [Array]
+      # @return [String] a header value
+      def header_from(type, *params)
+        if type.to_s.casecmp('basic').zero? && params.size == 2
+          basic_header_from(*params)
+        elsif params.size != 1
+          raise ArgumentError, "Unexpected params received (got #{params.size} instead of 1)"
+        else
+          value = params.first
+          value = value.call if value.is_a?(Proc)
+          "#{type} #{value}"
+        end
+      end
+
+      def basic_header_from(login, pass)
+        value = Base64.encode64("#{login}:#{pass}")
+        value.delete!("\n")
+        "Basic #{value}"
       end
     end
   end
diff --git a/lib/faraday/request/basic_authentication.rb b/lib/faraday/request/basic_authentication.rb
deleted file mode 100644
index 61c9a5bc3..000000000
--- a/lib/faraday/request/basic_authentication.rb
+++ /dev/null
@@ -1,20 +0,0 @@
-# frozen_string_literal: true
-
-require 'base64'
-
-module Faraday
-  class Request
-    # Authorization middleware for Basic Authentication.
-    class BasicAuthentication < load_middleware(:authorization)
-      # @param login [String]
-      # @param pass [String]
-      #
-      # @return [String] a Basic Authentication header line
-      def self.header(login, pass)
-        value = Base64.encode64([login, pass].join(':'))
-        value.delete!("\n")
-        super(:Basic, value)
-      end
-    end
-  end
-end
diff --git a/lib/faraday/request/token_authentication.rb b/lib/faraday/request/token_authentication.rb
deleted file mode 100644
index f28264b1c..000000000
--- a/lib/faraday/request/token_authentication.rb
+++ /dev/null
@@ -1,20 +0,0 @@
-# frozen_string_literal: true
-
-module Faraday
-  class Request
-    # TokenAuthentication is a middleware that adds a 'Token' header to a
-    # Faraday request.
-    class TokenAuthentication < load_middleware(:authorization)
-      # Public
-      def self.header(token, options = nil)
-        options ||= {}
-        options[:token] = token
-        super(:Token, options)
-      end
-
-      def initialize(app, token, options = nil)
-        super(app, token, options)
-      end
-    end
-  end
-end
diff --git a/spec/faraday/connection_spec.rb b/spec/faraday/connection_spec.rb
index 0a1298117..4ff56335e 100644
--- a/spec/faraday/connection_spec.rb
+++ b/spec/faraday/connection_spec.rb
@@ -141,28 +141,6 @@
     end
   end
 
-  describe 'basic_auth' do
-    subject { conn }
-
-    context 'calling the #basic_auth method' do
-      before { subject.basic_auth 'Aladdin', 'open sesame' }
-
-      it { expect(subject.headers['Authorization']).to eq('Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ==') }
-    end
-
-    context 'adding basic auth info to url' do
-      let(:url) { 'http://Aladdin:open%20sesame@sushi.com/fish' }
-
-      it { expect(subject.headers['Authorization']).to eq('Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ==') }
-    end
-  end
-
-  describe '#token_auth' do
-    before { subject.token_auth('abcdef', nonce: 'abc') }
-
-    it { expect(subject.headers['Authorization']).to eq('Token nonce="abc", token="abcdef"') }
-  end
-
   describe '#build_exclusive_url' do
     context 'with relative path' do
       subject { conn.build_exclusive_url('sake.html') }
@@ -605,7 +583,6 @@
 
     context 'after manual changes' do
       before do
-        subject.basic_auth('', '')
         subject.headers['content-length'] = 12
         subject.params['b'] = '2'
         subject.options[:open_timeout] = 10
diff --git a/spec/faraday/request/authorization_spec.rb b/spec/faraday/request/authorization_spec.rb
index 3f13392e6..234861d68 100644
--- a/spec/faraday/request/authorization_spec.rb
+++ b/spec/faraday/request/authorization_spec.rb
@@ -3,7 +3,7 @@
 RSpec.describe Faraday::Request::Authorization do
   let(:conn) do
     Faraday.new do |b|
-      b.request auth_type, *auth_config
+      b.request :authorization, auth_type, *auth_config
       b.adapter :test do |stub|
         stub.get('/auth-echo') do |env|
           [200, {}, env[:request_headers]['Authorization']]
@@ -14,10 +14,10 @@
 
   shared_examples 'does not interfere with existing authentication' do
     context 'and request already has an authentication header' do
-      let(:response) { conn.get('/auth-echo', nil, authorization: 'Token token="bar"') }
+      let(:response) { conn.get('/auth-echo', nil, authorization: 'OAuth oauth_token') }
 
       it 'does not interfere with existing authorization' do
-        expect(response.body).to eq('Token token="bar"')
+        expect(response.body).to eq('OAuth oauth_token')
       end
     end
   end
@@ -25,7 +25,7 @@
   let(:response) { conn.get('/auth-echo') }
 
   describe 'basic_auth' do
-    let(:auth_type) { :basic_auth }
+    let(:auth_type) { :basic }
 
     context 'when passed correct params' do
       let(:auth_config) { %w[aladdin opensesame] }
@@ -44,43 +44,29 @@
     end
   end
 
-  describe 'token_auth' do
-    let(:auth_type) { :token_auth }
-
-    context 'when passed correct params' do
-      let(:auth_config) { 'quux' }
-
-      it { expect(response.body).to eq('Token token="quux"') }
-
-      include_examples 'does not interfere with existing authentication'
-    end
+  describe 'authorization' do
+    let(:auth_type) { :Bearer }
 
-    context 'when other values are provided' do
-      let(:auth_config) { ['baz', { foo: 42 }] }
+    context 'when passed a string' do
+      let(:auth_config) { ['custom'] }
 
-      it { expect(response.body).to match(/^Token /) }
-      it { expect(response.body).to match(/token="baz"/) }
-      it { expect(response.body).to match(/foo="42"/) }
+      it { expect(response.body).to eq('Bearer custom') }
 
       include_examples 'does not interfere with existing authentication'
     end
-  end
-
-  describe 'authorization' do
-    let(:auth_type) { :authorization }
 
-    context 'when passed two strings' do
-      let(:auth_config) { ['custom', 'abc def'] }
+    context 'when passed a proc' do
+      let(:auth_config) { [-> { 'custom_from_proc' }] }
 
-      it { expect(response.body).to eq('custom abc def') }
+      it { expect(response.body).to eq('Bearer custom_from_proc') }
 
       include_examples 'does not interfere with existing authentication'
     end
 
-    context 'when passed a string and a hash' do
-      let(:auth_config) { ['baz', { foo: 42 }] }
+    context 'when passed too many arguments' do
+      let(:auth_config) { %w[baz foo] }
 
-      it { expect(response.body).to eq('baz foo="42"') }
+      it { expect { response }.to raise_error(ArgumentError) }
 
       include_examples 'does not interfere with existing authentication'
     end