Function get_web_header_json_value 

pub fn get_web_header_json_value<T: DeserializeOwned>(
    response_str: &str,
) -> Result<HeaderQueryContent<T>>

Available on crate feature scraper only.

Parse a response string into the header JSON or its URL.

Strategy: first attempt to parse as JSON; if it fails, parse as HTML and extract the bmstable URL.

Returns

• HeaderQueryContent::Value: input is JSON;
• HeaderQueryContent::Url: input is HTML.

Errors

Returns an error when the input is HTML but the bmstable field cannot be found.