[squeak-dev] Interesting retrieval error with XMLDOMParser
Marcel Taeumel
marcel.taeumel at hpi.de
Thu Sep 23 08:59:19 UTC 2021
Hi --
It would be nice to have a streamlined support for loading XML documents from URLs. I think that WebClient would be the way to go for HTTP downloads:
(WebClient httpGet: 'https://w1.weather.gov/xml/current_obs/index.xml') contentStream
"XML-Parser" currently depends on "Files" because of SAXHandler class >> #parserOnFileNamed:. A dependency on "WebClient" might not hurt ... maybe through the "Tools" package? Hmmm...
Well, I don't like the class-side interface of SAXHandler and XMLDOMParser. Instead, I prefer the reader/writer notion like this:
XMLDOMParser onFileNamed: '...'
XMLDOMParser onURL: '...'
Considering the actual result, I like the interface of Form (for PNGs, JPEGs, etc.):
XMLDocument fromFileNamed: '...'
XMLDocument fromURL: '...'
Please find attached a change set that makes the proposed interface work in Squeak Trunk.
Best,
Marcel
Am 22.09.2021 22:30:08 schrieb gettimothy via Squeak-dev <squeak-dev at lists.squeakfoundation.org>:
Hi Folks,
No biggie, just interesting...
|tree url |
url := 'https://w1.weather.gov/xml/current_obs/index.xml [https://w1.weather.gov/xml/current_obs/index.xml]'.
tree := (XMLDOMParser on: (HTTPLoader default retrieveContentsFor: url) contents
) parseDocument.
tree explore.
(XMLDOMParser onURL: 'https://w1.weather.gov/xml/current_obs/index.xml [https://w1.weather.gov/xml/current_obs/index.xml]') parseDocument; explore. "throws an error"
The first form works on squeak.
The latter form works on pharo.
The latter does NOT Squeak because the XMLHTTPException: Forbidden (403) error gets thrown.
It is interesting that a platform difference would cause that error.
No biggie, but I would like to include a common retrieval method for both platforms in the XPathHelp (May turn it into a book down the road,too)
cheers.
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