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Subrequests for Zope2

Project description


plone.subrequest provides a mechanism for issuing subrequests under Zope2.


Plone 4

An entry point is provided so no special installation is required past adding plone.subrequest to your instance’s eggs.

Zope 2.12 without Plone

Load this package’s ZCML in the usual manner.

Zope 2.10

You must install ZPublisherEventsBackport to use this package with Zope 2.10 and load both package’s ZCML. The tests require Zope 2.12 / Python 2.6 so will not run.


Basic usage

Call subrequest(url), it returns a response object.

>>> from plone.subrequest import subrequest
>>> response = subrequest('/folder1/@@url')
>>> response.getBody()

response.getBody() also works for code that calls response.write(data). This one returns a text/non-byte value.

>>> response = subrequest('/@@response-write')
>>> response.getBody()
'Some data.\nSome more data.\n'

But in this case response.getBody() may only be called once.

>>> response.getBody()
Traceback (most recent call last):
ValueError: I/O operation on closed file

Accessing the response body as a file

Some code may call response.write(data).

>>> response = subrequest('/@@response-write')

In which case you may access response.stdout as file.

>>>, 0) or 0  # Py2 returns None, Py3 returns new position
>>> list(response.stdout)
['Some data.\n', 'Some more data.\n']

You can test whether a file was returned using response._wrote.

>>> response._wrote

When you’re done, close the file:

>>> response.stdout.close()

Use response.outputBody() to ensure the body may be accessed as a file.

>>> from plone.subrequest import subrequest
>>> response = subrequest('/folder1/@@url')
>>> response._wrote
>>> response.outputBody()
>>> response._wrote
>>>, 0) or 0  # Py2 returns None, Py3 returns new position
>>> list(response.stdout)

Relative paths

Relative paths are resolved relative to the parent request’s location:

>>> from plone.subrequest.tests import traverse
>>> request = traverse('/folder1/@@test')
>>> response = subrequest('folder1A/@@url')
>>> response.getBody()

This takes account of default view’s url.

>>> request = traverse('/folder1')
>>> request['URL'] == 'http://nohost/folder1/@@test'
>>> response = subrequest('folder1A/@@url')
>>> response.getBody()

Virtual hosting

When virtual hosting is used, absolute paths are traversed from the virtual host root.

>>> request = traverse('/VirtualHostBase/http/nohost:80/folder1/VirtualHostRoot/')
>>> response = subrequest('/folder1A/@@url')
>>> response.getBody()

Specifying the root

You may also set the root object explicitly

>>> app = layer['app']
>>> response = subrequest('/folder1A/@@url', root=app.folder1)
>>> response.getBody()

Error responses

Subrequests may not be found.

>>> response = subrequest('/not-found')
>>> response.status

Or might raise an error.

>>> response = subrequest('/@@error')
>>> response.status

Or might raise an error rendered by a custom error view.

>>> response = subrequest('/@@custom-error')
>>> response.status
>>> response.body
b'Custom exception occurred: A custom error'

So check for the expected status.

>>> response = subrequest('/')
>>> response.status == 200

Handling subrequests

The parent request is set as PARENT_REQUEST onto subrequests.

Subrequests also provide the plone.subrequest.interfaces.ISubRequest marker interface.


1.9.1 (2019-04-29)

Bug fixes:

  • fix regression bug which was breaking in Python 2.7 when tiles contain non-ascii characters [MrTango] (#22)

1.9.0 (2018-12-11)

Breaking changes:

  • Remove five.globalrequest dependency. It has been deprecated upstream (on Zope 4). [gforcada]

1.8.6 (2018-09-23)

New features:

  • Fix importsi without ZServer [pbauer]

Bug fixes:

  • More Python 3 compatibility. [ale-rt, thet]
  • Make test dependency on Archetypes optional. [davisagli]

1.8.5 (2018-01-30)

Bug fixes:

  • Add Python 2 / 3 compatibility [pbauer]

1.8.4 (2017-09-06)

New features:

  • Add support for Zope exception views when explicit exception handler is not defined [datakurre]

Bug fixes:

  • Fix issue where the example unauthorized_exception_handler did not properly set response status code [datakurre]

1.8.3 (2017-08-30)

Bug fixes:

  • Reverted “Remove vurl-parts from path”, which resulted in broken p.a.mosaic pages [thet]

1.8.2 (2017-07-20)

Bug fixes:

  • Remove vurl-parts from path [awello]

1.8.1 (2017-06-28)

Bug fixes:

  • Remove unittest2 dependency [kakshay21]

1.8 (2016-11-01)

New features:

  • Provide an exception-handler for rewriting Unauthorized to 401’s. [jensens]

1.7.0 (2016-05-04)


  • Allow to pass a custom exception handler for the response. [jensens]


  • When a subrequest modified the DB (or prior to the subrequest the main request), the oids annotated to the requests were doubled with each subsequent subrequest. This resulted in out-of-memory errors when using lots of subrequests, such as it happens on Mosaic based sites with a certain amount of tiles. Fixed by only adding new oids, not already known by parent request. [jensens]
  • Housekeeping: isort imports, autopep8, minor manual cleanup (no imports). [jensens]

1.6.11 (2015-09-07)

  • propagate IDisableCSRFProtection interface on subrequest to parent request object [vangheem]

1.6.10 (2015-08-14)

  • propagate registered safe writes from plone.protect to parent request object. [vangheem]

1.6.9 (2015-03-21)

  • Workaround for broken test because of missing dependency declaration in upstream package, see for details. [jensens]
  • Housekeeping and code cleanup (pep8, et al). [jensens]
  • Fix issue where new cookies from the main request.response are not passed to subrequests. [datakurre]
  • normalise request path_info so that string indexing works properly. [gweiss]

1.6.8 (2014-03-04)

  • Handle sub-requests which contain a doubled // in the path. [gweis]

1.6.7 (2012-10-22)

  • Ensure correct handling of bare virtual hosting urls. [elro]

1.6.6 (2012-06-29)

  • Log errors that occur handling a subrequest to help debug errors including content from a different url [anthonygerrard]

1.6.5 (2012-04-15)

  • Ensure parent url is a string and not unicode. [davisagli]

1.6.4 - 2012-03-22

  • Fix problems with double encoding some unicode charse by not copying too many other variables. [elro]

1.6.3 - 2012-02-12

  • Copy other request variables such as LANGUAGE to subrequest. [elro]

1.6.2 - 2011-07-04

1.6.1 - 2011-07-04

  • Move tests to package directory to making testing possible when installed normally.

1.6 - 2011-06-06

  • Ensure url is a string and not unicode. [elro]

1.6b2 - 2011-05-20

  • Set PARENT_REQUEST and add ISubRequest interface to subrequests. [elro]

1.6b1 - 2011-02-11

  • Handle IStreamIterator. [elro]
  • Simplify API so response.getBody() always works. [elro]

1.5 - 2010-11-26

  • Merge cookies from subrequest response into parent response. [awello]

1.4 - 2010-11-10

  • First processInput, then traverse (fixes #11254) [awello]

1.3 - 2010-08-24

  • Fixed bug with virtual hosting and quoted paths. [elro]

1.2 - 2010-08-16

  • Restore zope.component site after subrequest. [elro]

1.1 - 2010-08-14

  • Virtual hosting, relative url and error response support. [elro]

1.0 - 2010-07-28

  • Initial release. [elro]

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