You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@nutch.apache.org by "Sebastian Nagel (Jira)" <ji...@apache.org> on 2019/11/12 14:51:00 UTC
[jira] [Updated] (NUTCH-2599) charset detection issue with
parse-tika
[ https://issues.apache.org/jira/browse/NUTCH-2599?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sebastian Nagel updated NUTCH-2599:
-----------------------------------
Fix Version/s: 1.17
> charset detection issue with parse-tika
> ---------------------------------------
>
> Key: NUTCH-2599
> URL: https://issues.apache.org/jira/browse/NUTCH-2599
> Project: Nutch
> Issue Type: Bug
> Components: parser
> Environment: {code:java}
> plugin.includes: protocol-http|parse-tika{code}
> Reporter: Gerard Bouchar
> Priority: Major
> Fix For: 1.17
>
>
> Here is an example page that is displayed correctly in web browsers, but is decoded with the wrong charset in nutch : [https://gerardbouchar.github.io/html-encoding-example/index.html]
>
> This page's contents are encoded in UTF-8, it is served with HTTP headers indicating that it is in UTF-8, but it contains a bogus HTML meta tag indicating that is encoded in ISO-8859-1.
>
> This is a tricky case, but there is a [W3C specification about how to handle it|https://html.spec.whatwg.org/multipage/parsing.html#determining-the-character-encoding]. It clearly states that the HTTP header (transport layer information) should have precedence over the HTML meta tag (obtained in [byte stream prescanning|https://html.spec.whatwg.org/multipage/parsing.html#prescan-a-byte-stream-to-determine-its-encoding]). Browsers do respect the spec, but the tika parser doesn't.
>
> Looking at [the source code|https://github.com/apache/nutch/blob/master/src/plugin/parse-tika/src/java/org/apache/nutch/parse/tika/TikaParser.java], it looks like the charset information is not even extracted from the HTTP headers.
>
> {code:java}
> HTTP/1.1 200 OK
> Content-Type: text/html; charset=utf-8
> <!doctype html>
> <html>
> <head>
> <meta charset="iso-8859-1">
> </head>
> <body>
> <a href="/">français</a>
> </body>
> </html>
> {code}
--
This message was sent by Atlassian Jira
(v8.3.4#803005)