Use `FormBody.Builder` to build a request body that works like an HTML `<form>` tag. Names and values will be encoded using an HTML-compatible form URL encoding.

=== ":material-language-kotlin: Kotlin"
    ```kotlin
      private val client = OkHttpClient()

      fun run() {
        val formBody = FormBody.Builder()
            .add("search", "Jurassic Park")

}

public final class okhttp3/FormBody$Builder {
	public fun <init> ()V
	public fun <init> (Ljava/nio/charset/Charset;)V
	public synthetic fun <init> (Ljava/nio/charset/Charset;ILkotlin/jvm/internal/DefaultConstructorMarker;)V
	public final fun add (Ljava/lang/String;Ljava/lang/String;)Lokhttp3/FormBody$Builder;
	public final fun addEncoded (Ljava/lang/String;Ljava/lang/String;)Lokhttp3/FormBody$Builder;

}

public final class okhttp3/FormBody$Builder {
	public fun <init> ()V
	public fun <init> (Ljava/nio/charset/Charset;)V
	public synthetic fun <init> (Ljava/nio/charset/Charset;ILkotlin/jvm/internal/DefaultConstructorMarker;)V
	public final fun add (Ljava/lang/String;Ljava/lang/String;)Lokhttp3/FormBody$Builder;
	public final fun addEncoded (Ljava/lang/String;Ljava/lang/String;)Lokhttp3/FormBody$Builder;