Adding CSS to my html blows up my python code

Question

I'm trying to add CSS to the HTML that my python code generates. This line causes an error when I post the HTML:

html += '<link rel=\'stylesheet\' href=\'{{ url_for(\'static\', filename=\'css/main.css\') }}\'>'

I also tried putting the quotes on the outside, I get the same error:

html += "<link rel=\'stylesheet\' href=\'{{ url_for(\'static\', filename=\'css/main.css\') }}\'>"

The error I'm getting is:

requests.exceptions.HTTPError: 400 Client Error: Bad Request for url:

if I remove that one line I can PUT to the web page.

This is the code that writes the HTML to the page:

def write_data_to_confluence(auth, html, pageid, title = None):
    info = get_page_info(auth, pageid)
    ver = int(info['version']['number']) + 1
    ancestors = get_page_ancestors(auth, pageid)
    anc = ancestors[-1]
    del anc['_links']
    del anc['_expandable']
    del anc['extensions']
    if title is not None:
        info['title'] = title
    data = {
        'id' : str(pageid),
        'type' : 'page',
        'title' : info['title'],
        'version' : {'number' : ver},
        'ancestors' : [anc],
        'body'  : {
            'storage' :
            {
                'representation' : 'storage',
                'value' : str(html)
            }
        }
    }
    data = json.dumps(data)
    url = '{base}/{pageid}'.format(base = BASE_URL, pageid = pageid)
    r = requests.put(
        url,
        data = data,
        auth = auth,
        headers = { 'Content-Type' : 'application/json' }
    )
    r.raise_for_status()
    print("Wrote '%s' version %d" % (info['title'], ver))
    print("URL: %s%d" % (VIEW_URL, pageid))

I think I am quoting it wrong. I tried a couple different ways, but have yet to get it right. How can I quote this correctly?

Try using html += "..." so you don't have to escape all the single quotes inside the string. That should make it easier to see the real error. — John Gordon
– John Gordon, Commented Jun 10, 2019 at 16:36
html += """<link rel='stylesheet' href="{{ url_for('static', filename='css/main.css') }}">""" — Stam Kaly
– Stam Kaly, Commented Jun 10, 2019 at 16:36
I've tried all of the suggestions in this thread. I'm still getting the same error, unfortunately. This is the exact error that I'm getting: raise HTTPError(http_error_msg, response=self) requests.exceptions.HTTPError: 400 Client Error: Bad Request for url: https://wiki.us.cworld.company.com/rest/api/content/138335201 — bluethundr
– bluethundr, Commented Jun 10, 2019 at 16:48
I just found out that url_for() depends on flask being installed. I will try installing that and see if I can get this to work! — bluethundr
– bluethundr, Commented Jun 10, 2019 at 20:07

CaptainDaVinci · Accepted Answer · 2019-06-10 16:38:50Z

1

Try this approach,

html += "<link rel=\"stylesheet\" href=\"{{ url_for('static', filename='css/main.css') }}\">"

Escaping single quotes is not required as the string is enclosed in double quotes. The attribute values are enclosed in double quotes.

or, using triple quotes

html += """<link rel="stylesheet" href="{{ url_for('static', filename='css/main.css') }}">"""

answered Jun 10, 2019 at 16:38

CaptainDaVinci

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7 Comments

bluethundr Over a year ago

Thanks! I tried both your suggestions. I still get this error when I post:

Traceback (most recent call last):   File "C:\Users\tdunphy\AppData\Local\Programs\Python\Python37-32\lib\site-packages\requests\models.py", line 940, in raise_for_status     raise HTTPError(http_error_msg, response=self) requests.exceptions.HTTPError: 400 Client Error: Bad Request for url: https://wiki.us.cworld.company.com/rest/api/content/138335201

CaptainDaVinci Over a year ago

It might be due to a different reason. Can you share the code which handles the request?

bluethundr Over a year ago

Sure! I've just posted the code that writes the page to confluence in the OP.

CaptainDaVinci Over a year ago

Have you tried to post a request to the API using cURL or any other similar tool? It could be that the problem isn't with the html data you're sending, but something else.

bluethundr Over a year ago

I tried printing out the HTML variable from the code. Think this will help us get to the bottom of it? pastebin.com/p1XjQ7Hk

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Andrew Morozko · Accepted Answer · 2019-06-10 16:38:39Z

0

If you want to use string interpolation ({{ url_for...) then you need to use f-strings: f'interpolation: {{url_for(whatever)}}'

Also you can use double-quoted strings and not bother escaping every single quote: print("Single 'quotes' are fine here")

In more complex cases you can use multiline stings, they can contain newlines and other quote markers inside them, ''' this 'is' "ok" '''. There are '''string''' and """string""" versions, functionally the same.

answered Jun 10, 2019 at 16:38

Andrew Morozko

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10 Comments

bluethundr Over a year ago

Thank you. I tried both of these (one at a time), and I'm still getting the same error:

html += """ <link rel="stylesheet" href="{{ url_for('static', filename='css/main.css') }}"> """         html += ''' <link rel="stylesheet" href="{{ url_for('static', filename='css/main.css') }}"> '''

Andrew Morozko Over a year ago

@bluethundr You're still not using format-strings. If you add f before the opening quote: f""" my sting """ it should work. Right now {{ url_for... is just a text, it is not interpreted by python as a code

bluethundr Over a year ago

ok, I tried putting an 'f' in front of the quotes and I'm still getting the same error. I tried each of these lines: ` html += f""" <link rel="stylesheet" href="{{ url_for('static', filename='css/main.css') }}"> """ html += f''' <link rel="stylesheet" href="{{ url_for('static', filename='css/main.css') }}"> '''`

Andrew Morozko Over a year ago

Wait a second. Are you sure that you meant PUT and not POST request?

bluethundr Over a year ago

Sorry yes, I'm using PUT in the request. Think I'll do any better with a POST request?

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