运行代码加载Podbean Feed XML时遇Premature end of file错误求助

Hey there! Let's break down what's going wrong here and how to fix it quickly.

What's Causing the Error? #

The core issue is that Podbean's feed server blocks requests that don't include a valid User-Agent header.

• Browsers automatically send a standard User-Agent string (identifying the browser/OS), so the feed loads fine there.
• curl uses a default User-Agent like curl/[version], which Podbean's server might reject, resulting in an empty response.
• When you use XML.load(new URL(feed)) directly, the underlying Java URLConnection doesn't send a proper User-Agent either. The server returns an empty body, and the XML parser throws the "Premature end of file" error because there's nothing to parse.

How to Fix It #

You need to manually add a valid User-Agent header to your HTTP request. Here's how to adjust your Scala code to do that:

import scala.xml.XML
import java.net.{URL, HttpURLConnection}

val feedUrl = "https://fourfingerdiscount.podbean.com/feed/"
val connection = new URL(feedUrl).openConnection().asInstanceOf[HttpURLConnection]

// Add a browser-like User-Agent header to mimic a legitimate request
connection.setRequestProperty(
  "User-Agent",
  "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/118.0.0.0 Safari/537.36"
)

// Load the XML using the configured connection's input stream
val podcastXml = XML.load(connection.getInputStream())

Verify with curl First #

Before running the Scala code, you can confirm this is the problem by testing with curl and adding the User-Agent header:

curl -A "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/118.0.0.0 Safari/537.36" https://fourfingerdiscount.podbean.com/feed/

This should return the full XML feed content, confirming that the User-Agent was the missing piece.

内容的提问来源于stack exchange，提问作者Brad Cypert