How to get the name of a file downloaded with Angular $http?

Question

I\'ve written code that uses Angular $http to download a file. The name of the file is not specified in the URL. The URL contains a unique identifier for the file, wh

Answer 1

// SERVICE

downloadFile(params: any): Observable> {

    const url = `https://yoururl....etc`;


    return this.http.post>(
      url,
      params,
      {
        responseType: 'blob' as 'json',
        observe: 'response' as 'body'
      })
      .pipe(
        catchError(err => throwError(err))
      );
  }

// COMPONENT

import * as FileSaver from 'file-saver';

... some code

  download(param: any) {
    this.service.downloadFile(param).pipe(
    ).subscribe({
      next: (response: any) => {

        let fileName = 'file';
        const contentDisposition = response.headers.get('Content-Disposition');
        if (contentDisposition) {
          const fileNameRegex = /filename[^;=\n]*=((['"]).*?\2|[^;\n]*)/;
          const matches = fileNameRegex.exec(contentDisposition);
          if (matches != null && matches[1]) {
            fileName = matches[1].replace(/['"]/g, '');
          }
        }

        const fileContent = response.body;

        FileSaver.saveAs(fileContent, fileName);

      },
      error: (error) => {

        console.log({error});

      }
    });
  }

Enjoy