Charset variable includes a Content-Type attribute after "charset"

[vaabr]

Bug Report

Description

Charset variable in com.github.kittinunf.fuel.core.BodyRepresentation.kt includes an attribute after the charset which invokes java.nio.charset.IllegalCharsetNameException: UTF-8; API-VERSION=5.1. Azure DevOps sends this as the Content-Type: application/json; charset=utf-8; api-version=5.1.

To Reproduce

Steps to reproduce the behavior:

1. Send a post request to Azure DevOps
2. Get the response
3. Observe the exception being thrown

fun foo(body: String, auth: Pair<String, String>) = Fuel.post("https://dev.azure.com/*organization*/*project*/_apis/wit/workitems/\$Bug", listOf("api-version" to "5.1", "validateOnly" to "true"))
            .authentication()
            .basic(auth.first, auth.second)
            .header("Content-Type" to "application/json-patch+json")
            .body(body)
            .response()

Expected behavior

TEXT_CONTENT_TYPE regex excludes attributes after the charset

Environment

Development Machine

• OS: Win10
• IDE: IntelliJ
• Fuel version: 2.2.1
• Kotlin version: 1.3.61

Additional context

java.nio.charset.IllegalCharsetNameException: UTF-8; API-VERSION=5.1
	at java.base/java.nio.charset.Charset.checkName(Charset.java:308)
	at java.base/java.nio.charset.Charset.lookup2(Charset.java:482)
	at java.base/java.nio.charset.Charset.lookup(Charset.java:462)
	at java.base/java.nio.charset.Charset.forName(Charset.java:526)
	at com.github.kittinunf.fuel.core.BodyRepresentationKt.representationOfBytes(BodyRepresentation.kt:23)
	at com.github.kittinunf.fuel.core.requests.DefaultBody.asString(DefaultBody.kt:30)
	at com.github.kittinunf.fuel.core.Response.toString(Response.kt:50)
	at java.base/java.lang.String.valueOf(String.java:2951)
	at java.base/java.lang.StringBuilder.append(StringBuilder.java:168)

ADO reference:
https://docs.microsoft.com/en-us/rest/api/azure/devops/wit/work%20items/create?view=azure-devops-rest-5.1

UPD:
I have found a possible solution:
In com.github.kittinunf.fuel.core.BodyRepresentation.kt in the string 22 replace

val charsetName = charsetGroup.substringAfter('=').toUpperCase()

with

val charsetName = charsetGroup.substringAfter('=').substringBefore(';').toUpperCase()

Since the second group is ; charset=utf-8; api-version=5.1 it substrings the charset attribute value.