Python xhtml2pdf未加载字体'；s

正在尝试加载静态字体。直接呈现/加载页面时，所有内容都会加载。但当加载为pdf时，它不会加载正确的字体

pdf.html（也是的，我正在pdf页面上加载静态。也是的，按假设添加了链接。）：

utils.py

def render_to_pdf(template_src, context_dict={}):
template = get_template(template_src)
html = template.render(context_dict)
result = BytesIO()
pdf = pisa.CreatePDF(BytesIO(html.encode("UTF-8")),
                     result, encoding='UTF-8', link_callback=link_callback)
if not pdf.err:
    return HttpResponse(result.getvalue(), content_type='application/pdf')
return None

def link_callback(uri, rel):

s_url = settings.STATIC_URL      # Typically /static/
s_root = settings.STATIC_ROOT    # Typically /home/userX/project_static/
m_url = settings.MEDIA_URL       # Typically /static/media/
m_root = settings.MEDIA_ROOT     # Typically /home/userX/project_static/media/

if uri.startswith(m_url):
    path = os.path.join(m_root, uri.replace(m_url, ""))
elif uri.startswith(s_url):
    path = os.path.join(s_root, uri.replace(s_url, ""))
else:
    return uri  # handle absolute uri (ie: http://some.tld/foo.png)

if not os.path.isfile(path):
    raise Exception(
        'media URI must start with %s or %s' % (s_url, m_url)
    )
return path

---

我知道向src添加完整的URL路径是可行的，但这是不可接受的，因为我不想在每次需要加载某个内容时都更改路径

相同的问题，即使我无法加载字体

def render_to_pdf(template_src, context_dict={}):
template = get_template(template_src)
html = template.render(context_dict)
result = BytesIO()
pdf = pisa.CreatePDF(BytesIO(html.encode("UTF-8")),
                     result, encoding='UTF-8', link_callback=link_callback)
if not pdf.err:
    return HttpResponse(result.getvalue(), content_type='application/pdf')
return None

def link_callback(uri, rel):

s_url = settings.STATIC_URL      # Typically /static/
s_root = settings.STATIC_ROOT    # Typically /home/userX/project_static/
m_url = settings.MEDIA_URL       # Typically /static/media/
m_root = settings.MEDIA_ROOT     # Typically /home/userX/project_static/media/

if uri.startswith(m_url):
    path = os.path.join(m_root, uri.replace(m_url, ""))
elif uri.startswith(s_url):
    path = os.path.join(s_root, uri.replace(s_url, ""))
else:
    return uri  # handle absolute uri (ie: http://some.tld/foo.png)

if not os.path.isfile(path):
    raise Exception(
        'media URI must start with %s or %s' % (s_url, m_url)
    )
return path