servidor funciona, gpio desabilitat

node_modules/connect/lib/middleware/compress.js

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+/*!
+ * Connect - compress
+ * Copyright(c) 2010 Sencha Inc.
+ * Copyright(c) 2011 TJ Holowaychuk
+ * MIT Licensed
+ */
+
+/**
+ * Module dependencies.
+ */
+
+var zlib = require('zlib');
+
+/**
+ * Supported content-encoding methods.
+ */
+
+exports.methods = {
+    gzip: zlib.createGzip
+  , deflate: zlib.createDeflate
+};
+
+/**
+ * Default filter function.
+ */
+
+exports.filter = function(req, res){
+  return /json|text|javascript/.test(res.getHeader('Content-Type'));
+};
+
+/**
+ * Compress:
+ *
+ * Compress response data with gzip/deflate.
+ *
+ * Filter:
+ *
+ *  A `filter` callback function may be passed to
+ *  replace the default logic of:
+ *
+ *     exports.filter = function(req, res){
+ *       return /json|text|javascript/.test(res.getHeader('Content-Type'));
+ *     };
+ *
+ * Options:
+ *
+ *  All remaining options are passed to the gzip/deflate
+ *  creation functions. Consult node's docs for additional details.
+ *
+ *   - `chunkSize` (default: 16*1024)
+ *   - `windowBits`
+ *   - `level`: 0-9 where 0 is no compression, and 9 is slow but best compression
+ *   - `memLevel`: 1-9 low is slower but uses less memory, high is fast but uses more
+ *   - `strategy`: compression strategy
+ *
+ * @param {Object} options
+ * @return {Function}
+ * @api public
+ */
+
+module.exports = function compress(options) {
+  options = options || {};
+  var names = Object.keys(exports.methods)
+    , filter = options.filter || exports.filter;
+
+  return function compress(req, res, next){
+    var accept = req.headers['accept-encoding']
+      , vary = res.getHeader('Vary')
+      , write = res.write
+      , end = res.end
+      , stream
+      , method;
+
+    // vary
+    if (!vary) {
+      res.setHeader('Vary', 'Accept-Encoding');
+    } else if (!~vary.indexOf('Accept-Encoding')) {
+      res.setHeader('Vary', vary + ', Accept-Encoding');
+    }
+
+    // see #724
+    req.on('close', function(){
+      res.write = res.end = function(){};
+    });
+
+    // proxy
+
+    res.write = function(chunk, encoding){
+      if (!this.headerSent) this._implicitHeader();
+      return stream
+        ? stream.write(new Buffer(chunk, encoding))
+        : write.call(res, chunk, encoding);
+    };
+
+    res.end = function(chunk, encoding){
+      if (chunk) this.write(chunk, encoding);
+      return stream
+        ? stream.end()
+        : end.call(res);
+    };
+
+    res.on('header', function(){
+      var encoding = res.getHeader('Content-Encoding') || 'identity';
+
+      // already encoded
+      if ('identity' != encoding) return;
+
+      // default request filter
+      if (!filter(req, res)) return;
+
+      // SHOULD use identity
+      if (!accept) return;
+
+      // head
+      if ('HEAD' == req.method) return;
+
+      // default to gzip
+      if ('*' == accept.trim()) method = 'gzip';
+
+      // compression method
+      if (!method) {
+        for (var i = 0, len = names.length; i < len; ++i) {
+          if (~accept.indexOf(names[i])) {
+            method = names[i];
+            break;
+          }
+        }
+      }
+
+      // compression method
+      if (!method) return;
+
+      // compression stream
+      stream = exports.methods[method](options);
+
+      // header fields
+      res.setHeader('Content-Encoding', method);
+      res.removeHeader('Content-Length');
+
+      // compression
+
+      stream.on('data', function(chunk){
+        write.call(res, chunk);
+      });
+
+      stream.on('end', function(){
+        end.call(res);
+      });
+
+      stream.on('drain', function() {
+        res.emit('drain');
+      });
+    });
+
+    next();
+  };
+};