Remove CONTENT_TYPE_DEFAULT (#460)

Author: dr0i

metafacture-io/src/main/java/org/metafacture/io/HttpOpener.java

@@ -44,7 +44,7 @@
  * @author Jan Schnasse
  * @author Jens Wille
  */
-@Description("Opens an HTTP resource. Supports the setting of `Accept` and `Accept-Charset` as HTTP header fields, as well as generic headers (separated by `\\n`). Default setting of header `Accept` and `Content-Type` is '*/*' and `Encoding` is 'UTF-8'; default for 'method' is 'GET' and 'ErrorPrefix' is '@-'.")
+@Description("Opens an HTTP resource. Supports the setting of `Accept` and `Accept-Charset` as HTTP header fields, as well as generic headers (separated by `\\n`). Default setting of header `Accept` is '*/*' and `Encoding` is 'UTF-8'; default for 'method' is 'GET' and 'ErrorPrefix' is '@-'.")
 @In(String.class)
 @Out(Reader.class)
 @FluxCommand("open-http")
@@ -55,7 +55,6 @@ public final class HttpOpener extends DefaultObjectPipe<String, ObjectReceiver<R
 
     private static final String ACCEPT_DEFAULT = "*/*";
     private static final String ACCEPT_HEADER = "accept";
-    private static final String CONTENT_TYPE_DEFAULT = "*/*";
     private static final String CONTENT_TYPE_HEADER = "content-type";
     private static final String DEFAULT_PREFIX = "ERROR: ";
     private static final String ENCODING_DEFAULT = "UTF-8";
@@ -99,7 +98,6 @@ private boolean getInputAsBody() {
      */
     public HttpOpener() {
         setAccept(ACCEPT_DEFAULT);
-        setContentType(CONTENT_TYPE_DEFAULT);
         setEncoding(ENCODING_DEFAULT);
         setErrorPrefix(DEFAULT_PREFIX);
         setMethod(DEFAULT_METHOD);