--- /dev/null
+
+/*!
+ * Connect
+ * Copyright(c) 2011 TJ Holowaychuk
+ * MIT Licensed
+ */
+
+/**
+ * Module dependencies.
+ */
+
+var http = require('http')
+ , res = http.OutgoingMessage.prototype;
+
+// original setHeader()
+
+var setHeader = res.setHeader;
+
+/**
+ * Set header `field` to `val`, special-casing
+ * the `Set-Cookie` field for multiple support.
+ *
+ * @param {String} field
+ * @param {String} val
+ * @api public
+ */
+
+res.setHeader = function(field, val){
+ var key = field.toLowerCase()
+ , prev;
+
+ // special-case Set-Cookie
+ if (this._headers && 'set-cookie' == key) {
+ if (prev = this.getHeader(field)) {
+ val = Array.isArray(prev)
+ ? prev.concat(val)
+ : [prev, val];
+ }
+ // charset
+ } else if ('content-type' == key && this.charset) {
+ val += '; charset=' + this.charset;
+ }
+
+ return setHeader.call(this, field, val);
+};
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