scrapy FormRequest ignore Content-Type other values

The following code

super(FormRequest, self).__init__(*args, **kwargs)
if formdata:
    items = formdata.items() if isinstance(formdata, dict) else formdata
    querystr = _urlencode(items, self.encoding)
    if self.method == 'POST':
        self.headers.setdefault('Content-Type', 'application/x-www-form-urlencoded')
        self._set_body(querystr)
    else:
        self._set_url(self.url + ('&' if '?' in self.url else '?') + querystr)

Although the FormRequest base class Request sets the request header based on the value of the headers band, such as setting Content-Type = “application / json; charset = utf-8”, the code

 self.headers.setdefault('Content-Type', 'application/x-www-form-urlencoded')

sets the Content- Type value back to "application / x -www-form-urlencoded ". He did not consider headers own Content-Type situation.

[cathalgarvey]

Hi @andywubit - I’m inclined to close this unless we can get a reproducible example case to demonstrate the issue. It appears, from my reading and others, to be perhaps a case of misunderstanding. If you think we could improve our documentation to make this clearer, that’s a potential way we could take this?

Looking forward to your response.

[dangra]

@andywubit can you provide a code snippet that reproduces your issue? thanks