Binary.Decompress possible error?

[Elitlogik]

Binary.Length(Web.Contents("https://epss.cyentia.com/epss_scores-current.csv.gz"))

Returns 1391340

Binary.Length(Binary.Decompress(Web.Contents("https://epss.cyentia.com/epss_scores-current.csv.gz"), Compression.GZip))

Returns 63

Why? Please help me.

[jennratten]

Sometimes the data will be chunked when compressed or encoded so you may be experiencing data loss if it's not handled accordingly.  Try querying the headers to get more info like below. The content length should be included in the response.

let
 searchText = "Power Query"
in
 Web.Headers(
 "https://www.bing.com",
 [
 RelativePath = "search",
 Query = [q = searchText]
 ]
 )

[Elitlogik]

Hi, thank you for your response.

The Gzipped CSV from cyentia.com is what I want to fetch and analyze in Power BI.

Downloading it manually, Unzip with 7zip and open in Excel works fine.

Using the code in the original post results in a table with only one row.

Isn't it strange that a Compressed file is 1.4 MB compressed and 63 characters Decompressed?

[jennratten]

That particular compression method is very old and is limited in bits.  

[Elitlogik]

I understand. You mean that the Binary.Decompress with the Compression.GZip parameter is old code? Because GZip as a standard is still vewry widely used on the web.

Strangely enough it decompresses another 8 MB file from another source just fine.