diff --git a/akka-http-core/src/main/resources/reference.conf b/akka-http-core/src/main/resources/reference.conf
index b07f3a5ba6..717c0f77cb 100644
--- a/akka-http-core/src/main/resources/reference.conf
+++ b/akka-http-core/src/main/resources/reference.conf
@@ -147,8 +147,19 @@ akka.http {
     # under the HTTP specification even without this header.
     # If a header cannot be parsed into a high-level model instance it will be
     # provided as a `RawHeader`.
+    # If logging is enabled it is performed with the configured
+    # `error-logging-verbosity`.
     illegal-header-warnings = on
 
+    # Configures the verbosity with which message (request or response) parsing
+    # errors are written to the application log.
+    #
+    # Supported settings:
+    # `off`   : no log messages are produced
+    # `simple`: a condensed single-line message is logged
+    # `full`  : the full error details (potentially spanning several lines) are logged
+    error-logging-verbosity = full
+
     # limits for the number of different values per header type that the
     # header cache will hold
     header-cache {
diff --git a/akka-http-core/src/main/scala/akka/http/engine/client/HttpClient.scala b/akka-http-core/src/main/scala/akka/http/engine/client/HttpClient.scala
index bc00dbcd13..f05ba87d68 100644
--- a/akka-http-core/src/main/scala/akka/http/engine/client/HttpClient.scala
+++ b/akka-http-core/src/main/scala/akka/http/engine/client/HttpClient.scala
@@ -17,7 +17,7 @@ import akka.stream.scaladsl._
 import akka.stream.scaladsl.OperationAttributes._
 import akka.http.model.{ IllegalResponseException, HttpMethod, HttpRequest, HttpResponse }
 import akka.http.engine.rendering.{ RequestRenderingContext, HttpRequestRendererFactory }
-import akka.http.engine.parsing.{ ParserOutput, HttpHeaderParser, HttpResponseParser }
+import akka.http.engine.parsing._
 import akka.http.util._
 
 /**
@@ -58,11 +58,10 @@ private[http] object HttpClient {
 
     // the initial header parser we initially use for every connection,
     // will not be mutated, all "shared copy" parsers copy on first-write into the header cache
-    val rootParser = new HttpResponseParser(
-      parserSettings,
-      HttpHeaderParser(parserSettings) { errorInfo ⇒
-        if (parserSettings.illegalHeaderWarnings) log.warning(errorInfo.withSummaryPrepended("Illegal response header").formatPretty)
-      })
+    val rootParser = new HttpResponseParser(parserSettings, HttpHeaderParser(parserSettings) { info ⇒
+      if (parserSettings.illegalHeaderWarnings)
+        logParsingError(info withSummaryPrepended "Illegal response header", log, parserSettings.errorLoggingVerbosity)
+    })
 
     val requestRendererFactory = new HttpRequestRendererFactory(userAgentHeader, requestHeaderSizeHint, log)
 
diff --git a/akka-http-core/src/main/scala/akka/http/engine/parsing/ParserSettings.scala b/akka-http-core/src/main/scala/akka/http/engine/parsing/ParserSettings.scala
index 34b954fc90..683950234e 100644
--- a/akka-http-core/src/main/scala/akka/http/engine/parsing/ParserSettings.scala
+++ b/akka-http-core/src/main/scala/akka/http/engine/parsing/ParserSettings.scala
@@ -4,6 +4,7 @@
 
 package akka.http.engine.parsing
 
+import java.util.Locale
 import com.typesafe.config.Config
 import scala.collection.JavaConverters._
 import akka.http.model.{ StatusCode, HttpMethod, Uri }
@@ -21,6 +22,7 @@ final case class ParserSettings(
   maxChunkSize: Int,
   uriParsingMode: Uri.ParsingMode,
   illegalHeaderWarnings: Boolean,
+  errorLoggingVerbosity: ParserSettings.ErrorLoggingVerbosity,
   headerValueCacheLimits: Map[String, Int],
   customMethods: String ⇒ Option[HttpMethod],
   customStatusCodes: Int ⇒ Option[StatusCode]) extends HttpHeaderParser.Settings {
@@ -66,9 +68,25 @@ object ParserSettings extends SettingsCompanion[ParserSettings]("akka.http.parsi
       c getIntBytes "max-chunk-size",
       Uri.ParsingMode(c getString "uri-parsing-mode"),
       c getBoolean "illegal-header-warnings",
+      ErrorLoggingVerbosity(c getString "error-logging-verbosity"),
       cacheConfig.entrySet.asScala.map(kvp ⇒ kvp.getKey -> cacheConfig.getInt(kvp.getKey))(collection.breakOut),
       _ ⇒ None,
       _ ⇒ None)
   }
+
+  sealed trait ErrorLoggingVerbosity
+  object ErrorLoggingVerbosity {
+    case object Off extends ErrorLoggingVerbosity
+    case object Simple extends ErrorLoggingVerbosity
+    case object Full extends ErrorLoggingVerbosity
+
+    def apply(string: String): ErrorLoggingVerbosity =
+      string.toLowerCase(Locale.ROOT) match {
+        case "off"    ⇒ Off
+        case "simple" ⇒ Simple
+        case "full"   ⇒ Full
+        case x        ⇒ throw new IllegalArgumentException(s"[$x] is not a legal `error-logging-verbosity` setting")
+      }
+  }
 }
 
diff --git a/akka-http-core/src/main/scala/akka/http/engine/parsing/package.scala b/akka-http-core/src/main/scala/akka/http/engine/parsing/package.scala
index f65b10107f..12f6a1cd22 100644
--- a/akka-http-core/src/main/scala/akka/http/engine/parsing/package.scala
+++ b/akka-http-core/src/main/scala/akka/http/engine/parsing/package.scala
@@ -6,15 +6,16 @@ package akka.http.engine
 
 import java.lang.{ StringBuilder ⇒ JStringBuilder }
 import scala.annotation.tailrec
+import akka.event.LoggingAdapter
 import akka.util.ByteString
 import akka.http.model.{ ErrorInfo, StatusCode, StatusCodes }
 import akka.http.util.SingletonException
 
+/**
+ * INTERNAL API
+ */
 package object parsing {
 
-  /**
-   * INTERNAL API
-   */
   private[http] def escape(c: Char): String = c match {
     case '\t'                           ⇒ "\\t"
     case '\r'                           ⇒ "\\r"
@@ -23,25 +24,24 @@ package object parsing {
     case x                              ⇒ x.toString
   }
 
-  /**
-   * INTERNAL API
-   */
   private[http] def byteChar(input: ByteString, ix: Int): Char = byteAt(input, ix).toChar
 
-  /**
-   * INTERNAL API
-   */
   private[http] def byteAt(input: ByteString, ix: Int): Byte =
     if (ix < input.length) input(ix) else throw NotEnoughDataException
 
-  /**
-   * INTERNAL API
-   */
   private[http] def asciiString(input: ByteString, start: Int, end: Int): String = {
     @tailrec def build(ix: Int = start, sb: JStringBuilder = new JStringBuilder(end - start)): String =
       if (ix == end) sb.toString else build(ix + 1, sb.append(input(ix).toChar))
     if (start == end) "" else build()
   }
+
+  private[http] def logParsingError(info: ErrorInfo, log: LoggingAdapter,
+                                    setting: ParserSettings.ErrorLoggingVerbosity): Unit =
+    setting match {
+      case ParserSettings.ErrorLoggingVerbosity.Off    ⇒ // nothing to do
+      case ParserSettings.ErrorLoggingVerbosity.Simple ⇒ log.warning(info.summary)
+      case ParserSettings.ErrorLoggingVerbosity.Full   ⇒ log.warning(info.formatPretty)
+    }
 }
 
 package parsing {
diff --git a/akka-http-core/src/main/scala/akka/http/engine/server/HttpServer.scala b/akka-http-core/src/main/scala/akka/http/engine/server/HttpServer.scala
index 76e6107e51..1f73d58101 100644
--- a/akka-http-core/src/main/scala/akka/http/engine/server/HttpServer.scala
+++ b/akka-http-core/src/main/scala/akka/http/engine/server/HttpServer.scala
@@ -13,12 +13,12 @@ import akka.stream.stage.PushPullStage
 import akka.stream.scaladsl.OperationAttributes._
 import akka.stream.scaladsl._
 import akka.stream._
-import akka.http.engine.parsing.{ HttpHeaderParser, HttpRequestParser }
+import akka.http.engine.parsing._
 import akka.http.engine.rendering.{ ResponseRenderingContext, HttpResponseRendererFactory }
-import akka.http.engine.parsing.ParserOutput._
 import akka.http.engine.TokenSourceActor
 import akka.http.model._
 import akka.http.util._
+import ParserOutput._
 
 /**
  * INTERNAL API
@@ -50,14 +50,14 @@ private[http] object HttpServer {
 
   def serverBlueprint(settings: ServerSettings,
                       log: LoggingAdapter)(implicit mat: FlowMaterializer): Graph[HttpServerPorts, Unit] = {
+    import settings._
 
     // the initial header parser we initially use for every connection,
     // will not be mutated, all "shared copy" parsers copy on first-write into the header cache
-    val rootParser = new HttpRequestParser(
-      settings.parserSettings,
-      settings.rawRequestUriHeader,
-      HttpHeaderParser(settings.parserSettings) { errorInfo ⇒
-        if (settings.parserSettings.illegalHeaderWarnings) log.warning(errorInfo.withSummaryPrepended("Illegal request header").formatPretty)
+    val rootParser = new HttpRequestParser(parserSettings, rawRequestUriHeader,
+      HttpHeaderParser(parserSettings) { info ⇒
+        if (parserSettings.illegalHeaderWarnings)
+          logParsingError(info withSummaryPrepended "Illegal request header", log, parserSettings.errorLoggingVerbosity)
       })
 
     val responseRendererFactory = new HttpResponseRendererFactory(settings.serverHeader, settings.responseHeaderSizeHint, log)
@@ -149,7 +149,7 @@ private[http] object HttpServer {
           this.requestStart = requestStart
           ctx.changeCompletionHandling(waitingForApplicationResponseCompletionHandling)
           waitingForApplicationResponse
-        case (ctx, _, MessageStartError(status, info)) ⇒ finishWithError(ctx, "request", status, info)
+        case (ctx, _, MessageStartError(status, info)) ⇒ finishWithError(ctx, status, info)
         case _                                         ⇒ throw new IllegalStateException
       }
 
@@ -181,12 +181,13 @@ private[http] object HttpServer {
         onUpstreamFailure = {
           case (ctx, _, EntityStreamException(errorInfo)) ⇒
             // the application has forwarded a request entity stream error to the response stream
-            finishWithError(ctx, "request", StatusCodes.BadRequest, errorInfo)
+            finishWithError(ctx, StatusCodes.BadRequest, errorInfo)
           case (ctx, _, error) ⇒ { ctx.fail(error); SameState }
         })
 
-      def finishWithError(ctx: MergeLogicContextBase, target: String, status: StatusCode, info: ErrorInfo): State[Any] = {
-        log.warning("Illegal {}, responding with status '{}': {}", target, status, info.formatPretty)
+      def finishWithError(ctx: MergeLogicContextBase, status: StatusCode, info: ErrorInfo): State[Any] = {
+        logParsingError(info withSummaryPrepended s"Illegal request, responding with status '$status'",
+          log, settings.parserSettings.errorLoggingVerbosity)
         val msg = if (settings.verboseErrorMessages) info.formatPretty else info.summary
         // FIXME this is a workaround that is supposed to be solved by issue #16753
         ctx match {
@@ -195,7 +196,6 @@ private[http] object HttpServer {
             fullCtx.emit(ResponseRenderingContext(HttpResponse(status, entity = msg), closeRequested = true))
           case other ⇒ throw new IllegalStateException(s"Unexpected MergeLogicContext [${other.getClass.getName}]")
         }
-        //
         finish(ctx)
       }