etag check middleware missing

[fengmk2]

$ cnpm install cnpm
npm WARN package.json bower@0.6.8 No repository field.
npm WARN package.json itodo@0.0.4 No repository field.
npm WARN package.json sfile@0.0.6 No repository field.
npm WARN package.json jshint@0.7.1 No repository field.
npm http GET http://r.cnpmjs.org/cnpm
npm http 200 http://r.cnpmjs.org/cnpm
npm http GET http://r.cnpmjs.org/commander/2.1.0
npm http GET http://r.cnpmjs.org/npm-request/0.0.3
npm http GET http://r.cnpmjs.org/debug/0.7.4
npm http GET http://r.cnpmjs.org/bagpipe/0.3.5
npm http GET http://r.cnpmjs.org/open/0.0.4
npm http GET http://r.cnpmjs.org/urllib/0.5.5
npm http GET http://r.cnpmjs.org/colors/0.6.2
npm http 200 http://r.cnpmjs.org/commander/2.1.0
npm http 200 http://r.cnpmjs.org/npm-request/0.0.3
npm http 200 http://r.cnpmjs.org/open/0.0.4
npm http 200 http://r.cnpmjs.org/debug/0.7.4
npm http 200 http://r.cnpmjs.org/bagpipe/0.3.5
npm http GET http://r.cnpmjs.org/debug/download/debug-0.7.4.tgz
npm http GET http://r.cnpmjs.org/npm-request/download/npm-request-0.0.3.tgz
npm http GET http://r.cnpmjs.org/bagpipe/download/bagpipe-0.3.5.tgz
npm http GET http://r.cnpmjs.org/commander/download/commander-2.1.0.tgz
npm http GET http://r.cnpmjs.org/open/download/open-0.0.4.tgz
npm http 200 http://r.cnpmjs.org/colors/0.6.2
npm http 200 http://r.cnpmjs.org/urllib/0.5.5
npm http GET http://r.cnpmjs.org/colors/download/colors-0.6.2.tgz
npm http GET http://r.cnpmjs.org/urllib/download/urllib-0.5.5.tgz
npm http 200 http://r.cnpmjs.org/debug/download/debug-0.7.4.tgz
npm http 200 http://r.cnpmjs.org/open/download/open-0.0.4.tgz
npm http 200 http://r.cnpmjs.org/npm-request/download/npm-request-0.0.3.tgz
npm http 200 http://r.cnpmjs.org/bagpipe/download/bagpipe-0.3.5.tgz
npm http 200 http://r.cnpmjs.org/colors/download/colors-0.6.2.tgz
npm http 200 http://r.cnpmjs.org/urllib/download/urllib-0.5.5.tgz
npm http 200 http://r.cnpmjs.org/commander/download/commander-2.1.0.tgz
npm http GET http://r.cnpmjs.org/buffer-concat/0.0.1
npm http GET http://r.cnpmjs.org/debug/0.7.2
npm http 200 http://r.cnpmjs.org/buffer-concat/0.0.1
npm http 200 http://r.cnpmjs.org/debug/0.7.2
npm http GET http://r.cnpmjs.org/debug/download/debug-0.7.2.tgz
npm http GET http://r.cnpmjs.org/buffer-concat/download/buffer-concat-0.0.1.tgz
npm http 200 http://r.cnpmjs.org/debug/download/debug-0.7.2.tgz
npm http 200 http://r.cnpmjs.org/buffer-concat/download/buffer-concat-0.0.1.tgz
cnpm@0.0.27 node_modules/cnpm
├── npm-request@0.0.3
├── debug@0.7.4
├── commander@2.1.0
├── colors@0.6.2
├── open@0.0.4
├── bagpipe@0.3.5
└── urllib@0.5.5 (buffer-concat@0.0.1, debug@0.7.2)

[dead-horse]

use https://github.com/koajs/etag ?

[fengmk2]

嗯，用它吧

[fengmk2]

我找到connect的版本了，是我们的response-patch，然后里面依赖了 response-send

[fengmk2]

// ETag support
  // TODO: W/ support
  if (len > 1024) {
    var etag = String(Buffer.isBuffer(body)
      ? crc.buffer.crc32(body)
      : crc.crc32(body));
    if (!this.getHeader('ETag')) this.setHeader('ETag', etag);
  }

  // determine if it's cacheable
  var cache = 'GET' == method || 'HEAD' == method;
  if (cache) cache = (this.statusCode >= 200 && this.statusCode < 300) || 304 == this.statusCode;

  // freshness
  if (fresh(req.headers, this._headers) && cache) {
    this.statusCode = 304;
  }

  // strip irrelevant headers
  if (204 == this.statusCode || 304 == this.statusCode) {
    this.removeHeader('Content-Type');
    this.removeHeader('Content-Length');
    body = '';
  }

  // respond
  this.end('HEAD' == method ? null : body);
  return this;

[fengmk2]

我实现一个 koa-fresh

[fengmk2]

app.use(etag());
app.use(refresh());