diff -r 647602e8291a -r eaf30d5aaf6a core/src/luan/modules/LuanUrl.java
--- a/core/src/luan/modules/LuanUrl.java	Fri Jun 03 17:51:58 2016 -0600
+++ b/core/src/luan/modules/LuanUrl.java	Fri Jun 03 18:43:27 2016 -0600
@@ -41,8 +41,30 @@
 					throw new LuanException( "invalid method: "+methodStr );
 				}
 			}
+			Map headerMap = getMap(luan,map,"headers");
+			if( headerMap != null ) {
+				headers = new HashMap();
+				for( Object hack : headerMap.entrySet() ) {
+					Map.Entry entry = (Map.Entry)hack;
+					String key = (String)entry.getKey();
+					Object val = entry.getValue();
+					String name = toHttpHeaderName(key);
+					if( val instanceof String ) {
+						headers.put(name,val);
+					} else {
+						if( !(val instanceof LuanTable) )
+							throw new LuanException( "header '"+key+"' must be string or table" );
+						LuanTable t = (LuanTable)val;
+						if( !t.isList() )
+							throw new LuanException( "header '"+key+"' table must be list" );
+						headers.put(name,t.asList());
+					}
+				}
+			}
 			Map auth = getMap(luan,map,"authorization");
 			if( auth != null ) {
+				if( headers!=null && headers.containsKey("Authorization") )
+					throw new LuanException( "can't define authorization with header 'Authorization' defined" );
 				String user = getString(auth,"user");
 				String password = getString(auth,"password");
 				if( !auth.isEmpty() )
@@ -88,7 +110,7 @@
 				if( this.method==Method.POST ) {
 					content = sb.toString();
 				} else { // GET
-					String urlS = url.toString();
+					String urlS = this.url.toString();
 					if( urlS.indexOf('?') == -1 ) {
 						urlS += '?';
 					} else {
@@ -96,7 +118,7 @@
 					}
 					urlS += sb;
 					try {
-						url = new URL(urlS);
+						this.url = new URL(urlS);
 					} catch(IOException e) {
 						throw new RuntimeException(e);
 					}
@@ -107,6 +129,24 @@
 		}
 	}
 
+	public static String toHttpHeaderName(String luanName) {
+		luanName = luanName.toLowerCase();
+		StringBuilder buf = new StringBuilder();
+		boolean capitalize = true;
+		char[] a = luanName.toCharArray();
+		for( int i=0; i<a.length; i++ ) {
+			char c = a[i];
+			if( c == '_'  || c == '-' ) {
+				a[i] = '-';
+				capitalize = true;
+			} else if( capitalize ) {
+				a[i] = Character.toUpperCase(c);
+				capitalize = false;
+			}
+		}
+		return String.valueOf(a);
+	}
+
 	private static void and(StringBuilder sb) {
 		if( sb.length() > 0 )
 			sb.append('&');

diff -r 647602e8291a -r eaf30d5aaf6a http/src/luan/modules/http/HttpServicer.java
--- a/http/src/luan/modules/http/HttpServicer.java	Fri Jun 03 17:51:58 2016 -0600
+++ b/http/src/luan/modules/http/HttpServicer.java	Fri Jun 03 18:43:27 2016 -0600
@@ -33,6 +33,7 @@
 import luan.DeepCloner;
 import luan.modules.PackageLuan;
 import luan.modules.IoLuan;
+import luan.modules.LuanUrl;
 import luan.modules.TableLuan;
 import luan.modules.Utils;
 
@@ -193,6 +194,7 @@
 	}
 
 	public static String toHttpHeaderName(String luanName) {
+/*
 		StringBuilder buf = new StringBuilder();
 		boolean capitalize = true;
 		char[] a = luanName.toCharArray();
@@ -207,6 +209,8 @@
 			}
 		}
 		return String.valueOf(a);
+*/
+		return LuanUrl.toHttpHeaderName(luanName);
 	}
 
 	private static String escape(String value) {