diff --git a/lib/rubygems/remote_fetcher.rb b/lib/rubygems/remote_fetcher.rb
index 6ed0842963e6..40615376832e 100644
--- a/lib/rubygems/remote_fetcher.rb
+++ b/lib/rubygems/remote_fetcher.rb
@@ -210,9 +210,7 @@ def fetch_file(uri, *_)
 
   def fetch_http(uri, last_modified = nil, head = false, depth = 0)
     fetch_type = head ? Gem::Net::HTTP::Head : Gem::Net::HTTP::Get
-    response   = request uri, fetch_type, last_modified do |req|
-      headers.each {|k,v| req.add_field(k,v) }
-    end
+    response   = request uri, fetch_type, last_modified, headers
 
     case response
     when Gem::Net::HTTPOK, Gem::Net::HTTPNotModified then
@@ -308,15 +306,13 @@ def cache_update_path(uri, path = nil, update = true)
   # a Gem::Net::HTTP response object.  request maintains a table of persistent
   # connections to reduce connect overhead.
 
-  def request(uri, request_class, last_modified = nil)
+  def request(uri, request_class, last_modified = nil, headers = {})
     proxy = proxy_for @proxy, uri
     pool  = pools_for(proxy).pool_for uri
 
-    request = Gem::Request.new uri, request_class, last_modified, pool
+    request = Gem::Request.new uri, request_class, last_modified, pool, headers
 
-    request.fetch do |req|
-      yield req if block_given?
-    end
+    request.fetch
   end
 
   def https?(uri)
diff --git a/lib/rubygems/request.rb b/lib/rubygems/request.rb
index 9116785231ea..c2f32251ec59 100644
--- a/lib/rubygems/request.rb
+++ b/lib/rubygems/request.rb
@@ -14,7 +14,7 @@ def self.create_with_proxy(uri, request_class, last_modified, proxy) # :nodoc:
     proxy ||= get_proxy_from_env(uri.scheme)
     pool = ConnectionPools.new proxy_uri(proxy), cert_files
 
-    new(uri, request_class, last_modified, pool.pool_for(uri))
+    new(uri, request_class, last_modified, pool.pool_for(uri), {})
   end
 
   def self.proxy_uri(proxy) # :nodoc:
@@ -26,12 +26,13 @@ def self.proxy_uri(proxy) # :nodoc:
     end
   end
 
-  def initialize(uri, request_class, last_modified, pool)
+  def initialize(uri, request_class, last_modified, pool, initheader)
     @uri = uri
     @request_class = request_class
     @last_modified = last_modified
     @requests = Hash.new(0).compare_by_identity
     @user_agent = user_agent
+    @initheader = initheader
 
     @connection_pool = pool
   end
@@ -139,7 +140,7 @@ def connection_for(uri)
   end
 
   def fetch
-    request = @request_class.new @uri.request_uri
+    request = @request_class.new @uri.request_uri, @initheader
 
     unless @uri.nil? || @uri.user.nil? || @uri.user.empty?
       request.basic_auth Gem::UriFormatter.new(@uri.user).unescape,
@@ -155,8 +156,6 @@ def fetch
       request.add_field "If-Modified-Since", @last_modified.httpdate
     end
 
-    yield request if block_given?
-
     perform_request request
   end
 
diff --git a/lib/rubygems/s3_uri_signer.rb b/lib/rubygems/s3_uri_signer.rb
index 148cba38c47a..eb22285897d1 100644
--- a/lib/rubygems/s3_uri_signer.rb
+++ b/lib/rubygems/s3_uri_signer.rb
@@ -177,13 +177,11 @@ def ec2_metadata_credentials_imds_v1
   end
 
   def ec2_metadata_request(url, token:)
-    request = ec2_iam_request(Gem::URI(url), Gem::Net::HTTP::Get)
+    request = ec2_iam_request(Gem::URI(url), Gem::Net::HTTP::Get, token ? {
+      "X-aws-ec2-metadata-token" => token,
+    } : {})
 
-    response = request.fetch do |req|
-      if token
-        req.add_field "X-aws-ec2-metadata-token", token
-      end
-    end
+    response = request.fetch
 
     case response
     when Gem::Net::HTTPOK then
@@ -194,11 +192,11 @@ def ec2_metadata_request(url, token:)
   end
 
   def ec2_metadata_token
-    request = ec2_iam_request(Gem::URI(EC2_IAM_TOKEN), Gem::Net::HTTP::Put)
+    request = ec2_iam_request(Gem::URI(EC2_IAM_TOKEN), Gem::Net::HTTP::Put, {
+      "X-aws-ec2-metadata-token-ttl-seconds" => "60",
+    })
 
-    response = request.fetch do |req|
-      req.add_field "X-aws-ec2-metadata-token-ttl-seconds", 60
-    end
+    response = request.fetch
 
     case response
     when Gem::Net::HTTPOK then
@@ -208,9 +206,9 @@ def ec2_metadata_token
     end
   end
 
-  def ec2_iam_request(uri, verb)
+  def ec2_iam_request(uri, verb, headers)
     @request_pool ||= create_request_pool(uri)
-    Gem::Request.new(uri, verb, nil, @request_pool)
+    Gem::Request.new(uri, verb, nil, @request_pool, headers)
   end
 
   def create_request_pool(uri)
diff --git a/test/rubygems/test_gem_remote_fetcher.rb b/test/rubygems/test_gem_remote_fetcher.rb
index 5c1d89fad693..335d0391cce3 100644
--- a/test/rubygems/test_gem_remote_fetcher.rb
+++ b/test/rubygems/test_gem_remote_fetcher.rb
@@ -516,7 +516,7 @@ def test_fetch_http
     @fetcher = fetcher
     url = "http://gems.example.com/redirect"
 
-    def fetcher.request(uri, request_class, last_modified = nil)
+    def fetcher.request(uri, request_class, last_modified = nil, headers = {})
       url = "http://gems.example.com/redirect"
       if defined? @requested
         res = Gem::Net::HTTPOK.new nil, 200, nil
@@ -541,7 +541,7 @@ def test_fetch_http_redirects
     @fetcher = fetcher
     url = "http://gems.example.com/redirect"
 
-    def fetcher.request(uri, request_class, last_modified = nil)
+    def fetcher.request(uri, request_class, last_modified = nil, headers = {})
       url = "http://gems.example.com/redirect"
       res = Gem::Net::HTTPMovedPermanently.new nil, 301, nil
       res.add_field "Location", url
@@ -560,7 +560,7 @@ def test_fetch_http_redirects_without_location
     @fetcher = fetcher
     url = "http://gems.example.com/redirect"
 
-    def fetcher.request(uri, request_class, last_modified = nil)
+    def fetcher.request(uri, request_class, last_modified = nil, headers = {})
       res = Gem::Net::HTTPMovedPermanently.new nil, 301, nil
       res
     end
@@ -572,18 +572,6 @@ def fetcher.request(uri, request_class, last_modified = nil)
     assert_equal "redirecting but no redirect location was given (#{url})", e.message
   end
 
-  def test_request_block
-    fetcher = Gem::RemoteFetcher.new nil
-    @fetcher = fetcher
-
-    assert_throws :block_called do
-      fetcher.request Gem::URI("http://example"), Gem::Net::HTTP::Get do |req|
-        assert_kind_of Gem::Net::HTTPGenericRequest, req
-        throw :block_called
-      end
-    end
-  end
-
   def test_yaml_error_on_size
     use_ui @stub_ui do
       fetcher = Gem::RemoteFetcher.new nil
diff --git a/test/rubygems/test_gem_remote_fetcher_s3.rb b/test/rubygems/test_gem_remote_fetcher_s3.rb
index 4a5acc5a8666..9fe82af5b408 100644
--- a/test/rubygems/test_gem_remote_fetcher_s3.rb
+++ b/test/rubygems/test_gem_remote_fetcher_s3.rb
@@ -49,8 +49,8 @@ def initialize(uri, method)
       super
     end
 
-    def ec2_iam_request(uri, verb)
-      fake_s3_request = FakeGemRequest.new(uri, verb, nil, nil)
+    def ec2_iam_request(uri, verb, headers)
+      fake_s3_request = FakeGemRequest.new(uri, verb, nil, nil, headers)
       @aws_iam_calls << fake_s3_request
 
       case uri.to_s
@@ -90,7 +90,7 @@ def res.body = FakeS3URISigner.instance_profile
   class FakeGemFetcher < Gem::RemoteFetcher
     attr_reader :fetched_uri, :last_s3_uri_signer
 
-    def request(uri, request_class, last_modified = nil)
+    def request(uri, ...)
       @fetched_uri = uri
       res = Gem::Net::HTTPOK.new nil, 200, nil
       def res.body = "success"