diff --git a/TINetworking/Sources/Parameters/ParameterEncoding.swift b/TINetworking/Sources/Parameters/ParameterEncoding.swift
deleted file mode 100644
index ff1b362c..00000000
--- a/TINetworking/Sources/Parameters/ParameterEncoding.swift
+++ /dev/null
@@ -1,6 +0,0 @@
-protocol ParameterEncoding {
-    associatedtype Location: ParameterLocation
-    associatedtype Result
-
-    func encode(parameters: [String: Parameter<Location>]) -> Result
-}
diff --git a/TINetworking/Sources/Request/Request.swift b/TINetworking/Sources/Request/Request.swift
index ff1562f3..07a2bad2 100644
--- a/TINetworking/Sources/Request/Request.swift
+++ b/TINetworking/Sources/Request/Request.swift
@@ -7,7 +7,7 @@ public struct Request<Content: BodyContent> {
     public var requestBodyContent: Content
     public var queryParameters: [String: Parameter<LocationQuery>]
     public var pathParameters: [String: Parameter<LocationPath>]
-    public var headerParameters: [KeyValueTuple<String, String>]
+    public var headerParameters: HTTPHeaders?
     public var cookieParameters: [String: Parameter<LocationCookie>]
     public var acceptableStatusCodes: Set<Int>
     public var serverOverride: Server?
@@ -22,7 +22,7 @@ public struct Request<Content: BodyContent> {
                 requestBodyContent: Content,
                 queryParameters: [String: Parameter<LocationQuery>] = [:],
                 pathParameters: [String: Parameter<LocationPath>] = [:],
-                headerParameters: [KeyValueTuple<String, String>] = [],
+                headerParameters: HTTPHeaders? = nil,
                 cookieParameters: [String: Parameter<LocationCookie>] = [:],
                 acceptableStatusCodes: Set<Int> = [200],
                 serverOverride: Server? = nil,