langchain/document_loaders/pdf.py/MathpixPDFLoader/get_processed_pdf
class MathpixPDFLoader:    def get_processed_pdf(self, pdf_id: str) -> str:
        self.wait_for_processing(pdf_id)
        url = f"{self.url}/{pdf_id}.{self.processed_file_format}"
        response = requests.get(url, headers=self.headers)
        return response.content.decode("utf-8")