Maybe fix curlString

fuel/src/main/kotlin/com/github/kittinunf/fuel/core/Body.kt

@@ -1,5 +1,6 @@
 package com.github.kittinunf.fuel.core
 
+import com.github.kittinunf.fuel.core.requests.RepeatableBody
 import java.io.InputStream
 import java.io.OutputStream
 
@@ -58,6 +59,12 @@ interface Body {
      */
     val length: Long?
 
+    /**
+     * Makes the body repeatable by e.g. loading its contents into memory
+     * @return [RepeatableBody] the body to be repeated
+     */
+    fun asRepeatable(): RepeatableBody = RepeatableBody(this)
+
     /**
      * Represents this body as a string
      * @param contentType [String] the type of the content in the body, or null if a guess is necessary

fuel/src/main/kotlin/com/github/kittinunf/fuel/core/extensions/Formatting.kt

@@ -22,6 +22,7 @@ fun Request.httpString(): String = buildString {
     headers.transformIterate(appendHeaderWithValue)
 
     // body
+    body(body.asRepeatable())
     appendln()
     appendln(String(body.toByteArray()))
 }
@@ -43,6 +44,7 @@ fun Request.cUrlString(): String = buildString {
     }
 
     // body
+    body(body.asRepeatable())
     val escapedBody = String(body.toByteArray()).replace("\"", "\\\"")
     if (escapedBody.isNotEmpty()) {
         append(" -d \"$escapedBody\"")
@@ -54,4 +56,4 @@ fun Request.cUrlString(): String = buildString {
 
     // url
     append(" $url")
-}
+}

fuel/src/main/kotlin/com/github/kittinunf/fuel/core/requests/DefaultBody.kt

@@ -116,12 +116,6 @@ data class DefaultBody(
         }
     }
 
-    /**
-     * Makes the body repeatable by e.g. loading its contents into memory
-     * @return [RepeatableBody] the body to be repeated
-     */
-    fun asRepeatable(): RepeatableBody = RepeatableBody(this)
-
     companion object {
         private val EMPTY_STREAM = {
             ByteArrayInputStream(ByteArray(0))

fuel/src/main/kotlin/com/github/kittinunf/fuel/core/requests/RepeatableBody.kt

@@ -75,4 +75,10 @@ data class RepeatableBody(
      * @return [Long?] the length in bytes, null if it is unknown
      */
     override val length = body.length
+
+    /**
+     * Makes the body repeatable by e.g. loading its contents into memory
+     * @return [RepeatableBody] the body to be repeated
+     */
+    override fun asRepeatable(): RepeatableBody = this
 }