I am trying developing an iPhone app with mySpaceID iPhone SDK but can't figure out this problem. I also tried with OAuth console (http://developer.myspace.com/Modules/APIs/Pages/OAuthTool.aspx) but for every PUT/POST request I get error 401: Invalid digital signature for base string Request: http://api.myspace.com/roa/09/statusmood/@me/@self/?oauth_consumer_key=171bbf14531e4a4c91b178a25f558d30&oauth_nonce=634523084676939493&oauth_signature=VORPnw3AWguo15ZZ7lBBHqDQye0%3D&oauth_signature_method=HMAC-SHA1&oauth_timestamp=1316711360&oauth_token=VArncwrFka%252FwJZLLsI6jXkImnzfzgX3Zx2MZlhWJietNuaumStQT8gHKNA3B1sntv6%252FffJmTbN%252Byc5ZtetWxmLl52EnQNcRJWcWZ0HnNtjM%253D Response: {"statusCode":"401","statusDescription":"Invalid digital signature for base string: \"PUT&http%3A%2F%2Fapi.myspace.com%2Froa%2F09%2Fstatusmood%2F%40me%2F%40self%2F&oauth_consumer_key%3D171bbf14531e4a4c91b178a25f558d30%26oauth_nonce%3D634523084676939493%26oauth_signature_method%3DHMAC-SHA1%26oauth_timestamp%3D1316711360%26oauth_token%3DVArncwrFka%252FwJZLLsI6jXkImnzfzgX3Zx2MZlhWJietNuaumStQT8gHKNA3B1sntv6%252FffJmTbN%252Byc5ZtetWxmLl52EnQNcRJWcWZ0HnNtjM%253D\""}