Labels Update:

Replace Area-BrowserBackend by Area-Internals

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There is the OpenSearch Parameter extension that adds support for POST requests: http://www.opensearch.org/Specifications/OpenSearch/Extensions/Parameter/1.0

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Some search engines (e.g. dir.bg) use POST instead of GET.  Firefox supports 
search engines (or bookmark keywords, or both, I can't remember) doing POST, 
and we have support for it at the URLFetcher layer, so mostly we'd just need 
to add something to TemplateURLs.  I don't know if the OpenSearch spec says 
something about this.

I looked into this. The code to parse the parameter extension from OpenSearch and add it to TemplateURL is quite simple. The way this TemplateURL then gets passed down to be fetched is much more complicated, however. The NavigationEntry that needs to be created can store POST data, but it gets created with webkit tools which have no current FormData analogs in webkit/glue. Either faking it or creating those analogs is possible. There's also some messiness in passing the form data triggers from where the GURL is made from the TemplateURL down to the navigation controller that would have to be done.

I have a patch for this which does the parsing and has a couple potential approaches to populating the NavigationEntry, but it looks like there'd need to be some refactoring to make this bug as straightforward as we first thought.

Greg, can you post any useful partial work you've got somewhere?  It looks like I'm going to be interested in seeing this happen.

 Issue 90344  has been merged into this issue.

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The POST support has been added for TemplateURL. Close this bug as fixed.

And how would one use this?

This isn't fixed until the support actually works.  See bug 268698.

We also should support importing such search engines.  That can probably be a separate bug.

Holy F*k, why do I have 390 search engines?

I only use the ones (maybe a dozen) I added myself (Google, Wikipedia, etc).

I takes ages to edit an entry in this huge list.