[Twisted-Python] Re: Error Request did not return a string

Maarten ter Huurne maarten at treewalker.org
Mon Aug 4 16:50:24 EDT 2008

On Monday 04 August 2008, DJ wrote:

> For some strange reason I this text is being added to the end of the html
> pages rendered by twisted.
> Request did not return a string
> Request:
> <GET /config/deleteSection HTTP/1.1>
> Resource:
> <configPages.deleteSection instance at 0x00EC4EE0>
> Value:
> None
> I am using the resource.Resource and render. My html is passed has a
> string using request.write.
> As far has I can tell, there should not be a problem. Does anyone know
> why and what I need to do to fix this.

Python functions implicitly return None if there is no return statement.

Twisted.web wants the render method to either return a string, or the 
special object NOT_DONE_YET, which indicates that the reply will be written 
with request.write(). The name was probably chosen for cases where the 
content is written using deferreds, but it should be used even if you call 
request.write() from the render method.

So try putting "return server.NOT_DONE_YET" at the end of your render 

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