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Editorial Team
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Asked: 2026-06-05T14:01:06+00:00

I uploaded my 4MB mpe file in App engine blobstore. By retrieving its Blob-key,

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I uploaded my 4MB mpe file in App engine blobstore. By retrieving its Blob-key, i tried to play it in jsp file using HTML 5 audio tag. But its not working . The code is given below:

<%@page import="com.google.appengine.api.blobstore.BlobKey" %>
<%@page import="com.google.appengine.api.blobstore.BlobstoreService" %>
<%@page import="com.google.appengine.api.blobstore.BlobstoreServiceFactory" %>
<html>
<head>
<meta http-equiv="Content-Type" content="audio/mpeg3; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<%
BlobstoreService blobstoreService = BlobstoreServiceFactory.getBlobstoreService();
BlobKey blobKey = new BlobKey(request.getParameter("blob-key"));
%><%=request.getParameter("blob-key")%>

<audio controls="controls">
  <source src="<%=request.getParameter("blob-key")%>" type="audio/mp3" />
</audio>
</body>
</html>
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1 Answer

  1. Editorial Team

    Your audio tag’s src attribute should point to an Url where a blob (audio stream) can be downloaded. Instead it just holds a value of the blob key (which is a random string and not an Url, so it does not point anywhere).

    It’s best to start reading how to serve a blob.

    Basically, there isn’t an universal blob-serving url, that you could just make a request to and it would serve your blob. You need to create a servlet that serves blobs (see example in the link) and then point the HTML5 audio control to it via src="/path/to/your/blob/servlet?key=<%=request.getParameter("blob-key")%>".

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