431da946_ToolConfigSyntax___Galaxy_Wiki__required
[attribute] URL_method [values] get, post [details] Only if "tool_type" attribute value is "data_source" - defines the HTTP request method to use when communicating with an external data source application ( the default is "get" ). [example] URL_method="post" [required] 
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Admin/Tools/ToolConfigSyntax - Galaxy Wiki
required