Kami commented on issue #1321: SignatureDoesNotMatch for manual request URL: https://github.com/apache/libcloud/issues/1321#issuecomment-513560984 Which signature algorithm you are using? I believe we default to v2. I imagine it's something related to the nested dictionary you are trying to use - in EC2 driver we send data via query parameters and not as part of a request body. This means you should use ``parent key.child key``` notation for your query param keys. So something like "params = {"LaunchTemplateData.ImageId: "...."}``. You can find an example of that here - https://github.com/apache/libcloud/pull/1224/files#diff-36825a12922cd525dde5f5dd9635f775R1887 If that doesn't work, I would add some debug / print statements to this method and see what is going on - https://github.com/apache/libcloud/blob/trunk/libcloud/common/aws.py#L205 And perhaps just try: ```python params = { 'Action': 'CreateLaunchTemplate', } ``` To see if that works (I believe it should and shouldn't throw signature mismatch error).
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