Extra strings when getting XML or CSV through Nginx

[Sal Munguia]

I have a nginx reverse proxy setup where nginx talks to apache. We are dumping an XML,CSV file, and are receiving extra characters from the dump as shown below:

CSV:

1 15043^{M
2 participant_id,redcap_survey_timestamp,redcap_survey_identifier,i_understand_1,secure_usage_agreement_comp>
3 - 1153 <DATA>
1154} M
1155 0^M
1156 M

XML:

1 859a3^{M
2 <?xml version="1.0" encoding="UTF-8" ?>
3 <records>
4 <item><participant_id><![CDATA[1]]></participant_id><redcap_survey_timestamp><![CDATA[2013-02-01 14:39:44]]>>
5 - 1155 <DATA>
1156} M

1157 0^M
1158 M

First column Line Number, Data precedes the line #.

Sal,

[Maxim Dounin]

Fix your backend (there is a bug in mod_php which causes Apache to return chunked encoding if one uses header("HTTP/1.1 ...")) or upgrade nginx, see ​this faq entry for details.

[Sal Munguia]

Turns out this is a chunked encoding issue. Will work on possibly enabling it on the Nginx side. I've applied the configuration change to Apache to disable chunked encoding on the PHP pages, and that has resolved the issue. Thanks.