Axios POST example to illustrate downloading of PDF from a REST api. Answer to the Stackoverflow question [Download binary file with Axios](https://stackoverflow.com/questions/49040247/download-binary-file-with-axios)

axios-download-pdf.js

axios.post("http://localhost:8080/reports/proposal-summary/",
            payload,
            {
                responseType: 'arraybuffer',
                headers: {
                    'Content-Type': 'application/json',
                    'Accept': 'application/pdf'
                }
            })
            .then((response) => {
                const url = window.URL.createObjectURL(new Blob([response.data]));
                const link = document.createElement('a');
                link.href = url;
                link.setAttribute('download', 'file.pdf'); //or any other extension
                document.body.appendChild(link);
                link.click();
            })
            .catch((error) => console.log(error));

Answer to the Stackoverflow question Download binary file with Axios.