public HttpRequest withBody(String body, Charset charset) {
        if (body != null) {
            this.body = new StringBody(body, charset);
        }
        return this;
    }
public HttpRequest withBody ( String body , Charset charset ) { if ( body != null ) { this . body = new StringBody ( body , charset ) ; } return this ; }
The exact string body to match on such as "this is an exact string body"

@param body    the body on such as "this is an exact string body"
@param charset character set the string will be encoded in