Azure File Storage - Creating a directory at the root level using REST

I have a Xamarin / iOS project, and looking to use Azure File Share as a back-end.
With that in mind, I'm playing around with the REST API and have generally got things working with (a) Blobs and (b) Account-level access to Files.
Specifically, I can successfully request a list of File Shares, so I have the general call structure worked out.
However, I'm stumped about the exact incantation necessary to create a new directory at the root level of a share.
I've tried the following three variants, but all result in Forbidden - Server failed to authenticate the request
request.Host: myaccount.file.core.windows.net
request.AbsolutePath: /myshare/subdirname1
request.Query: ?restype=directory
string to sign: PUT\n\n\n\n\n\n\n\n\n\n\n\nx-ms-date:Sun, 30 Nov 2014 16:07:25 GMT\nx-ms-version:2014-02-14\n/myaccount/myshare/subdirname1\nrestype:directory
request.Host: myaccount.file.core.windows.net
request.AbsolutePath: /myshare/subdirname1/
request.Query: ?restype=directory
string to sign: PUT\n\n\n\n\n\n\n\n\n\n\n\nx-ms-date:Sun, 30 Nov 2014 16:07:58 GMT\nx-ms-version:2014-02-14\n/myaccount/myshare/subdirname1/\nrestype:directory
request.Host: myaccount.file.core.windows.net
request.AbsolutePath: /myshare//subdirname1
request.Query: ?restype=directory
string to sign: PUT\n\n\n\n\n\n\n\n\n\n\n\nx-ms-date:Sun, 30 Nov 2014 16:06:16 GMT\nx-ms-version:2014-02-14\n/myaccount/myshare//subdirname1\nrestype:directory
I did note that trying to get the contents of an (empty) root directory doesn't behave quite the way I'd expect
request.Host: myaccount.file.core.windows.net
request.AbsolutePath: /myshare/
request.Query: ?resttype=directory&comp=list
string to sign: GET\n\n\n\n\n\n\n\n\n\n\n\nx-ms-date:Sun, 30 Nov 2014 16:23:17 GMT\nx-ms-version:2014-02-14\n/myaccount/myshare/\ncomp:list\nrestype:directory
Authenticates OK, but generates FAILURE BadRequest - The requested URI does not represent any resource on the server.
Which is different behaviour from pulling the list of blobs from an empty container (returns 200 with an empty xml list of blobs.
I've been through the File Service REST API document (dn167006) and found the azurestoragesamples on codeplex, but the former is unclear on working with the root level and the latter is from 2011 and predates File Storage.
Any insights?

First, thank you for the quick response and the suggestion about looking at the response content for the string to sign being used. I wasn't aware of that and obviously it's a fantastic resource for figuring this kind of stuff out.
And what it immediately revealed is it wasn't some subtle oddity in my construction of the STS, it was that I was doing a client.GetAsync(...) and not a client.PutAsync(...). DOH!
With that sorted, it was trivial to fix.
In terms of the List Directories and Files, though, there's still a problem.
FAILURE BadRequest - The requested URI does not represent any resource on the server.
   request.Host: myaccount.file.core.windows.net
   request.AbsolutePath: /myshare
   request.Query: ?resttype=directory&comp=list
   urlQuery: myshare?resttype=directory&comp=list
   string to sign: GET\n\n\n\n\n\n\n\n\n\n\n\nx-ms-date:Sun, 30 Nov 2014 18:40:04 GMT\nx-ms-version:2014-02-14\n/myaccount/myshare\ncomp:list\nresttype:directory
The response XML is
<?xml version="1.0" encoding="utf-8"?>
<Error>
   <Code>InvalidUri</Code>
   <Message>The requested URI does not represent any resource on the server.\nRequestId:33d61aed-001a-0020-0cbd-51aea8000000\nTime:2014-11-30T18:40:04.9712797Z</Message>
   <UriPath>/myshare</UriPath>
</Error>
I originally thought it might be because the share was empty. However, I'm targeting the same share in which I created (apparently successfully) the subdirectory.
So I'm still confuzzled on that.

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