Azure Blob Storage with SAS Token - azure

Question

I'm trying to upload a file to Azure Storage Account as Blob and I have a client provided by this "github.com/Azure/azure-storage-blob-go/azblob" package. As I saw in documentation there should be possibility to communicate with Storage using SAS Token creating anonymous credential with
credential := azblob.NewAnonymousCredential()
po := azblob.PipelineOptions{
Log: pipeline.LogOptions{
Log: func(s pipeline.LogLevel, m string) {
log.Tracef("pipeline message: %s", m)
},
ShouldLog: func(level pipeline.LogLevel) bool {
return level <= pipeline.LogError
},
},
}
pipeline := azblob.NewPipeline(credential, po)
However, I don't see an option to pass SAS Token which I receive from other service after I ask for access.
I also tried do it 'manually' using Azure Storage Account REST API, so my URL was like https://servicename.blob.core.windows.net/containerID/BlobID?sasToken... but all I get was 400, 411 and 501 HTTP codes depending on request header.
For example with
req.Header.Add("Accept", "*/*")
req.Header.Add("Accept-Language", "en-US,en;q=0.5 --compressed")
req.Header.Add("Accept-Encoding", "gzip, deflate, br")
req.Header.Add("content-type", "application/octet-stream")
req.Header.Add("x-ms-version", "2019-02-02")
req.Header.Add("x-ms-blob-type", "BlockBlob")
req.Header.Add("x-ms-client-request-id", "someID")
req.Header.Add("Connection", "keep-alive")
req.Header.Add("Content-Length", "512000")
req.Header.Add("Transfer-Encoding", "gzip, chunked, deflate")
I receive 400 code with
<?xml version="1.0" encoding="utf-8"?>
<Error>
<Code>MissingRequiredHeader</Code>
<Message>
An HTTP header that's mandatory for this request is not specified.
RequestId:someId
Time:2020-02-14T13:47:58.8383371Z
</Message>
<HeaderName>x-ms-original-content-length</HeaderName>
</Error>
Adding x-ms-original-content-length header changes nothing.
The funny fact is that it only happens when I try it in Go code. When I tried any REST Client it was working with these headers.
Summarizing, my need is to put a file into Azure Storage Account as a blob and the second solution which should simply work, does not work, and first one is not completed because I don't see the way to pass SAS Token. What am I missing?

Answer 1

So in the 1st case the problem was that SAS token is passed nowhere in this package. It should be added to URL later on during url creation like:
URL, err := url.Parse(blobURL + "/" + containerName + "/" + blobName + "?token as query"
And in the second case everything was about Content-Length which is not changeable from Header side. It's automatically set during http.NewRequest(...) but it must be one of following types *bytes.Buffer, *bytes.Reader or *strings.Reader. Otherwise it's 0. However http.NewRequest(...) accepts io.Reader as body, so it will compile with everything implementing io.Reader interface like *os.File but it will not set Content-Length which is required in case of Azure Storage Account. When I switched to one of three given types I listed above it started working.