Autodesk 查看器 double-compressed 个流

Question

使用 Autodesk 查看器时我收到错误：

An LMV resource ([redacted]/1/objects_attrs.json.gz) was not uncompressed by the browser. This hurts performance. Check the Content-Encoding header returned by the server and check whether you're getting double-compressed streams. The warning prints only once but it's likely the problem affects multiple resources.

我的回复header如下：

我的回复应该有 Content-Encoding: gzip header 吗？控制台中记录此错误时，是查看器而不是浏览器解压缩文件吗？

Answer 1

是的，如果您看到此警告，查看器正在处理解压缩，这在性能方面是不可取的。

你能看看我关于使用代理为你的查看器资源提供服务的文章吗：Securing your Forge Viewer token behind a proxy

这为 gzip 资源设置了正确的内容编码（node.js 代码）：

function fixContentHeaders (req, res) {

  // DS does not return content-encoding header
  // for gzip and other files that we know are gzipped,
  // so we add it here. The viewer does want
  // gzip files uncompressed by the browser
  if ( EXTENSIONS.gzip.indexOf (path.extname (req.path)) > -1 ) {
    res.set ('content-encoding', 'gzip')
  }

  if ( EXTENSIONS.json.indexOf (path.extname (req.path)) > -1 ){
    res.set ('content-type', 'application/json')
  }
}

此外，这还允许您直接从衍生服务提供文件：

//This API available from v 2.14 
Autodesk.Viewing.setEndpointAndApi( 
  window.location.origin + '/lmv-proxy', 
 'modelDerivativeV2')

Autodesk 查看器 double-compressed 个流

Autodesk Viewer double-compressed streams

autodesk-viewer