HTTP/1.1 400 error when trying to connect to an Azure Table with R

I'm new to R. I'm looking for a script to connect to an Azure Table, and I found some useful information in this thread: Connecting to Azure Table Storage in R

However, when I run the script I get an error very similar to the one that the user posting the question had, and I cannot figure out what's wrong.

This is the code I used (credentials have been modified):

# 1B) Connects to an Azure Table based on the specifications for Shared Key: https://docs.microsoft.com/en-us/rest/api/storageservices/authorize-with-shared-key

library(httr)
library(RCurl)
library(bitops)
library(xml2)

# Stores credentials in variable

Account <- "storageaccount"
Container <- "usage"
Key <- "key"


# Composes URL

URL <- paste0(
          "https://", 
          Account, 
          ".table.core.windows.net", 
          "/", 
          Container
        )

# Requests time stamp

requestdate <- format(Sys.time(), "%a, %d %b %Y %H:%M:%S %Z", tz = "UTC" )

content_lenght <- 0

# Composes signature string

signature_string <- paste0(
                     "GET", "\n",                 # HTTP Verb
                     "\n",                        # Content-MD-5
                     "text/xml", "\n",            # Content-Type
                     requestdate, "\n",           # Date
                     "/", Account, "/", Container # Canonicalized resource
                    )

# Composes header string

header_string <- add_headers(
                    Authorization=paste0(
                      "SharedKey ", 
                      Account, 
                      ":",
                      RCurl::base64(
                        digest::hmac(
                          key = RCurl::base64Decode(
                            Key, mode = "raw"
                          ),
                          object = enc2utf8(signature_string),
                          algo = "sha256", 
                          raw = TRUE
                            )
                        )
                    ),
                    'x-ms-date' = requestdate, 
                    'x-ms-version' = "2022-01-15",
                    'Content-type' = "text/xml"
                  )

# Creates request

xml_body = content(
                GET(
                  URL, 
                  config = header_string, 
                  verbose()
                  )
                )

When I run it, I get this error:

-> GET /Usage HTTP/1.1
-> Host: storageaccount.table.core.windows.net
-> User-Agent: libcurl/7.64.1 r-curl/4.3.2 httr/1.4.2
-> Accept-Encoding: deflate, gzip
-> Accept: application/json, text/xml, application/xml, */*
-> Authorization: SharedKey key
-> x-ms-date: Mon, 17 Jan 2022 15:47:30 UTC
-> x-ms-version: 2022-01-15
-> Content-type: text/xml
-> 
<- HTTP/1.1 400 The value for one of the HTTP headers is not in the correct format.
<- Content-Length: 371
<- Content-Type: application/xml
<- Server: Microsoft-HTTPAPI/2.0
<- x-ms-request-id: 0986de5d-9002-0064-1eb9-0b1166000000
<- Date: Mon, 17 Jan 2022 15:47:30 GMT
<- 
No encoding supplied: defaulting to UTF-8.

Any help would be greatly appreciated.

Also, I don't know if this relevant or not, but I've been prompted a couple of times to install the package Rtools, but when I search for this package I cannot find it.

Thanks in advance!

Thank you for your help!

So this is the code that works:

library(httr)
library(RCurl)
library(bitops)
library(xml2)

# Stores credentials in variable

Account <- "storageaccount"
Container <- "Usage"
Key <- "key"


# Composes URL

URL <- paste0(
          "https://", 
          Account, 
          ".table.core.windows.net", 
          "/", 
          Container
        )

# Requests time stamp

requestdate <- format(Sys.time(), "%a, %d %b %Y %H:%M:%S %Z", tz = "GMT")


# As per Microsoft's specs, an empty line is needed for content-length

content_lenght <- 0

# Composes signature string

signature_string <- paste0(
                     "GET", "\n",                 # HTTP Verb
                     "\n",                        # Content-MD-5
                     "text/xml", "\n",            # Content-Type
                     requestdate, "\n",           # Date
                     "/", Account, "/", Container # Canonicalized resource
                    )

# Composes header string

header_string <- add_headers(
                    Authorization=paste0(
                      "SharedKey ", 
                      Account, 
                      ":",
                      RCurl::base64(
                        digest::hmac(
                          key = RCurl::base64Decode(
                            Key, mode = "raw"
                          ),
                          object = enc2utf8(signature_string),
                          algo = "sha256", 
                          raw = TRUE
                            )
                        )
                    ),
                    'x-ms-date' = requestdate, 
                    'x-ms-version' = "2020-12-06",
                    'Content-type' = "text/xml"
                  )

# Creates request

xml_body = content(
                GET(
                  URL, 
                  config = header_string, 
                  verbose()
                  ),
                "text"
                )

Get_data <- xml_body                             # Gets data as text from API  
From_JSON <-fromJSON(Get_data, flatten = TRUE)   # Parses text from JSON
Table_name <- as.data.frame(From_JSON)           # Saves data to a table

I added the final three lines to parse the data from JSON format and saved into a table.