Output of XML: "valid XML header needed"-error (OpenSearch)?

isync has asked for the wisdom of the Perl Monks concerning the following question:

Replies are listed 'Best First'.
Re: Output of XML: "valid XML header needed"-error (OpenSearch)? by clinton (Priest) on Aug 24, 2007 at 17:53 UTC
There is no magic XML byte, and XML is text. Here are the things I would do: Check the headers that are actually being sent by your server. You could use use `wget -S http://yoururl` or a Firefox plugin like LiveHeaders Check that there is no whitespace before your XML declaration Check that your XML is valid with XML::LibXML::Schema - the online validator doesn't check schemas Check that your text is UTF-8 `print utf8::is_valid($text); print utf8::is_utf8($text)` Try with plain ASCII data, perhaps with a static file, just to see if that works If all of the above fails, try posting more of the code, plus a link to the URL that you are sending to OpenSearch, so we can look at it Clint	[reply] [d/l] [select]
Re: Output of XML: "valid XML header needed"-error (OpenSearch)? by moritz (Cardinal) on Aug 24, 2007 at 16:25 UTC
Are you sure that the client doesn't expect a `Content-Type: text/xml; charset=utf-8` header? And you really print utf8? Did you do a `Encode::decode("utf8", $string);` before you wrote it? And which client produces the error message? Have you tried to run your script locally and validated the output against a schema? Perl 6 in German -- Difficult Sudoku	[reply] [d/l] [select]
Re^2: Output of XML: "valid XML header needed"-error (OpenSearch)? by isync (Hermit) on Aug 24, 2007 at 17:23 UTC
Yes, I am sure. (Although I tried all kinds of headers - no result.) I tried Encode::decode and had negative result with and without it. Its amazon's client. YouTube has (except the values) the exactly same opensearch file layout - I even tried copy and paste their content - and sent it to amazon A9. Result: Error: no valid XML header in file. Their works: http://a9.com/-/opensearch/?url=http%3A%2F%2Fwww.youtube.com%2Fopensearch What is the magic to properly identify an XML file...?	[reply]
Re^3: Output of XML: "valid XML header needed"-error (OpenSearch)? by moritz (Cardinal) on Aug 24, 2007 at 17:59 UTC
Try to write your XML to a file and configure Apache to send the `application/opensearchdescription+xml` Content-Type (that's what youtube uses). Try to validate your XML, at least for well-formedness (for example with xmlstarlet), and use `wget --server-response $url` to check that your webserver delivers the right headers. Could you tell us your URL, so that I can take a look as well? Perl 6 in German -- Difficult Sudoku	[reply] [d/l] [select]
Re: Output of XML: "valid XML header needed"-error (OpenSearch)? by isync (Hermit) on Aug 24, 2007 at 18:58 UTC
The tip to just save it to filesystem and let apache handle it was great! It worked. Although I don't see why...: Header of working `Status: 200 OK Connection: close Date: Fri, 24 Aug 2007 18:29:38 GMT Accept-Ranges: bytes ETag: "13dae1c-2b2-2c196200" Server: Apache/2.0.54 (Unix) PHP/4.4.7 mod_ssl/2.0.54 OpenSSL/0.9.7e m +od_fastcgi/2.4.2 DAV/2 SVN/1.4.2 Content-Length: 690 Content-Type: application/xml Last-Modified: Fri, 24 Aug 2007 18:28:24 GMT Client-Date: Fri, 24 Aug 2007 18:29:43 GMT Client-Response-Num: 1` [download] Header of non-working: `Status: 200 OK Connection: close Date: Fri, 24 Aug 2007 18:41:50 GMT Accept-Ranges: none Server: Apache/2.0.54 (Unix) PHP/4.4.7 mod_ssl/2.0.54 OpenSSL/0.9.7e m +od_fastcgi/2.4.2 DAV/2 SVN/1.4.2 Content-Length: 690 Content-Type: application/xml Last-Modified: Fri, 24 Aug 2007 18:28:24 GMT Client-Date: Fri, 24 Aug 2007 18:41:57 GMT Client-Response-Num: 1` [download] Is ETag that important? (come on..)	[reply] [d/l] [select]
Re^2: Output of XML: "valid XML header needed"-error (OpenSearch)? by Anonymous Monk on Aug 25, 2007 at 10:07 UTC
ETag is irrelevant, it has to do with your data	[reply]
Re: Output of XML: "valid XML header needed"-error (OpenSearch)? by Anonymous Monk on Aug 24, 2007 at 19:36 UTC
Filed under Mystery. For now I use the "real file" hack... Thanks everyone!	[reply]
Re: Output of XML: "valid XML header needed"-error (OpenSearch)? by isync (Hermit) on Aug 30, 2007 at 09:05 UTC
No http-response experts among the Monks??	[reply]
Re^2: Output of XML: "valid XML header needed"-error (OpenSearch)? by Anonymous Monk on Aug 30, 2007 at 10:37 UTC
In Re: Output of XML: "valid XML header needed"-error (OpenSearch)?, content-length is NOT the same Content-Length: 4773 Content-Length: 4753 perldoc -f binmode	[reply]
Re^3: Output of XML: "valid XML header needed"-error (OpenSearch)? by isync (Hermit) on Aug 30, 2007 at 12:13 UTC
Arg! I posted two different tests... They were exactly 4773, both!	[reply]
Re^4: Output of XML: "valid XML header needed"-error (OpenSearch)? by Anonymous Monk on Aug 30, 2007 at 13:57 UTC
Re: Output of XML: "valid XML header needed"-error (OpenSearch)? by Anonymous Monk on Aug 29, 2007 at 18:36 UTC
Hey Monks! I need to revisit this topic: my script produces XML data which produces an error on A9. When I save the output and let Apache serve it, it works. Today I tried again to get it to work and did a whole slew of tests: 1. I downloaded it with LWP::UserAgent and compared the response objects: besides some minor stuff in the header (which shouldn't matter) - identical! 2. I did a wget on the resources and compared with the diff command - no diffs, which means - identical! 3. I had a look at the headers again and also compared mine with a completely different header which also works fine. Below the headers. `Connection: close Date: Wed, 29 Aug 2007 17:27:13 GMT Accept-Ranges: bytes ETag: "367930c-12a5-ca8adf00" Server: Apache/2.0.54 (Unix) PHP/4.4.7 mod_ssl/2.0.54 OpenSSL/0.9.7e m +od_fastcgi/2.4.2 DAV/2 SVN/1.4.2 Content-Length: 4773 Content-Type: application/xml Last-Modified: Wed, 29 Aug 2007 17:19:24 GMT Client-Date: Wed, 29 Aug 2007 17:27:14 GMT Client-Response-Num: 1` [download] - working! (data produced by my script and saved to filesystem. then served by apache) `Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre- +check=0 Connection: close Date: Wed, 29 Aug 2007 17:35:19 GMT Pragma: no-cache Server: Apache/2.0.59 (CentOS) Content-Type: application/xml; charset=UTF-8 Expires: Thu, 19 Nov 1981 08:52:00 GMT Client-Date: Wed, 29 Aug 2007 17:35:19 GMT Client-Response-Num: 1 Set-Cookie: PHPSESSID=flmm8b47j1d44dkmsiqjm71l74; path=/ X-Powered-By: PHP/5.1.6` [download] - working! (another site, not my data, but validated ok) `Connection: close Date: Wed, 29 Aug 2007 18:04:31 GMT Accept-Ranges: none Server: Apache/2.0.54 (Unix) PHP/4.4.7 mod_ssl/2.0.54 OpenSSL/0.9.7e m +od_fastcgi/2.4.2 DAV/2 SVN/1.4.2 Content-Length: 4753 Content-Type: application/xml Client-Date: Wed, 29 Aug 2007 18:04:33 GMT Client-Response-Num: 1 Set-Cookie: LX=ID=nth2ctfs6fpg&T=1188410672&L=en; expires=Sun, 17-Jan- +2038 10:00:00 GMT; path=/; domain=.lumerias.com` [download] - error (my data directly produced by the script but doesn't pass the test) Where is the invisible difference in my data?? As you can see both responses have the same length, content is completely identical (according to diff) and even the important headers (here: application/xml etc.) are the same...	[reply] [d/l] [select]