Send CSS compressed to Gzip with Flask

I wanted to improve the problem that bootstrap.min.css was slow to load, so I wondered how I could send css with gzip ... and I found out that it was successful, so I'll take note of it.

Make a View

For the time being, let's create a new View. This time we will send a Gzip compressed version of bootstrap.min.css, so create a URI with the name /bootstrap.gz.css.

@app.route("/bootstrap.gz.css")

Gzip compression

Then load the Gzip-compressed CSS file. (Probably it's okay to read a regular CSS file and compress it with the gzip module)

fp = open("static/css/bootstrap.min.css.gz")
content = fp.read()
fp.close()

Add a bit to the header

This is no good, so let's add some effort to the header. This time it is compressed with GZIP, so add the information to the Content-Encoding header.

res = make_response(content)
res.headers["Content-Type"] = "text/css"
res.headers["Content-Encoding"] = "gzip"

Putting these together gives the following code. This time I sent a compressed version of CSS, but I think you can do the same with Javascript and images ...!

@view.route("/bootstrap.gz.css")
def Bootstrap():
    fp = open("static/css/bootstrap.min.css.gz")
    content = fp.read()
    fp.close()

    res = make_response(content)
    res.headers["Content-Type"] = "text/css"
    res.headers["Content-Encoding"] = "gzip"

    return res

Please refer to it!

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