Removed re-encoding of multipart content-disposition header values

README.md

@@ -73,6 +73,11 @@ If you have a question, or hit a problem, feel free to ask on our [gitter channe
 
 Or, if you encounter a bug, something is unclear in the code or documentation, don’t hesitate and open an issue on GitHub.
 
+### Testing Scala.js
+
+Scala.js tests require [chromedriver](https://chromedriver.chromium.org/). It is downloaded automatically
+by the `test` task. Make sure to run it before running tests in any other way, e.g. using `testOnly`.
+
 ### Building & testing the scala-native version
 
 By default, sttp-native will **not** be included in the aggregate build of the root project. To include it, define the `STTP_NATIVE` environmental variable before running sbt, e.g.:

core/src/main/scala/sttp/model/Part.scala

@@ -41,10 +41,8 @@ case class Part[+T](
   // enumerate all variants so that overload resolution works correctly
   override def header(h: String): Option[String] = super.header(h)
 
-  def contentDispositionHeaderValue: String = {
-    def encode(s: String): String = new String(s.getBytes("utf-8"), "iso-8859-1")
-    "form-data; " + dispositionParamsSeq.map { case (k, v) => s"""$k="${encode(v)}"""" }.mkString("; ")
-  }
+  def contentDispositionHeaderValue: String =
+    "form-data; " + dispositionParamsSeq.map { case (k, v) => s"""$k="$v"""" }.mkString("; ")
 
   def dispositionParams: Map[String, String] = dispositionParamsSeq.toMap