Feed import breaks due to ajax error

Question

When I tried to do a feed import, I got the following error.

An AJAX HTTP error occurred.
HTTP Result Code: 200
Debugging information follows.
Path: /batch?id=1726&op=do
StatusText: OK
ResponseText [Omitted text]

(There are quite a few similar errors on the web, for example https://www.drupal.org/node/1125060.)
When I changed the author field to 'site-admin' (see attached image), auto-complete seems running and popup the following error.

An AJAX HTTP error occurred.
HTTP Result Code: 200
Debugging information follows.
Path: http://site-prod.local/user/autocomplete
StatusText: OK
ResponseText: my_site_name | my_username
[url1]
[url2]
[url3]
[Search form]
[Primary tab: View (active tab)]
[Edit]
[Shortcuts]
[Broken links]
[Devel output]
[My username]
[Email]
[Omitted text]

The log message is the following.

Warning: Cannot modify header information - headers already sent by (output started at /var/aegir/platforms/production/drupal-7.27/includes/common.inc:2700) in drupal_goto() (line 703 of /var/aegir/platforms/production/drupal-7.27/includes/common.inc).

If I put exit() right after drupal_json_output(). The related problem seems resolving itself.
When I run drush -d -v search-index, the indexing stuck at around 61%. This indicates some problems with a node.

kenpeter · Answer

By using xdebug and vdebug (plugin for vim), I am able to step into the code and ping point the issue. In https://api.drupal.org/api/drupal/includes!common.inc/function/drupal_cron_run/7 I put a watchdog: watchdog('bug_cron', '

'. print_r($module, true). '

'); inside. // Iterate through the modules calling their cron handlers (if any): foreach (module_implements('cron') as $module) { // Do not let an exception thrown by one module disturb another. try { // NOTE: put a watchdog and look at your log message. // You should able to see which module causes issues. watchdog('bug_cron', '

'. print_r($module, true). '

'); module_invoke($module, 'cron'); } catch (Exception $e) { watchdog_exception('cron', $e); } } It is the search module causes issues. Disable it, then uninstall the setting via the drupal menu GUI, then it is fixed, but I am not sure why search module causes issues. Updated at 2015-05-26 It turns out my module uses hook_url_inbound_alter + drupal_goto caused issues. It is not easy to debug, because there are couple of side effects.

Feed import breaks due to ajax error

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