rewrite code that reads request body

Author: muhammadn

src/main/kotlin/io/firetail/logging/servlet/FiretailMapper.kt

@@ -22,11 +22,12 @@ class FiretailMapper {
             .mapIndexed { _, value -> value to listOf(request.getHeader(value)) }
             .toMap()
 
+	val body = request.inputStream.bufferedReader().use { it.readText() }
         return FtRequest(
             httpProtocol = request.protocol,
             method = request.method,
             headers = headers,
-            body = request.inputStream.read().toString(),
+	    body = body,
             ip = request.remoteAddr,
             resource = request.requestURI,
             uri = request.requestURL.toString(), // FT calls the defines the URI as URL.

src/main/kotlin/io/firetail/logging/servlet/SpringResponseWrapper.kt

@@ -9,7 +9,7 @@ import java.io.PrintWriter
 import java.util.function.Consumer
 import org.springframework.web.util.ContentCachingResponseWrapper
 
-class SpringResponseWrapper(response: HttpServletResponse?) : ContentCachingResponseWrapper(response) {
+class SpringResponseWrapper(response: HttpServletResponse) : ContentCachingResponseWrapper(response) {
 
     val allHeaders: Map<String, String>
         get() {