`How can I extract content-disposition headers from an Angular 2 server response?`

Question

`How can I extract content-disposition headers from an Angular 2 server response?`

I'm having trouble locating the information on how to extract the filename from content disposition in the Angular 2 documentation. Can anyone provide guidance on how to read the headers from the server in Angular 2? Check out this helpful resource on content headers.

angular typescript

Answer 1

Answer №1

To implement the new Angular Http, you can follow the code snippet below in your Service.

  downloadFile(): Observable<HttpResponse<Blob>> {
    return this.http.get<Blob>(this.someURL, {
      observe: 'response',
      responseType: 'blob' as 'json'
    });
  }

Then, you can utilize the above function like this

 this.someService
  .downloadFile()
  .subscribe(
    (response: HttpResponse<Blob>) => {
      console.log(response.headers.get('content-disposition'));
      data = response.body
    });

Additionally, on the backend, it is important to include the following header in the response object:

'Access-Control-Expose-Headers': 'Content-Disposition'

Similarly, in Java Spring Boot, you can achieve the same functionality by using the code below

    final HttpHeaders headers = new HttpHeaders();
    headers.add(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=1.xlsx");
    headers.add(HttpHeaders.ACCESS_CONTROL_EXPOSE_HEADERS, HttpHeaders.CONTENT_DISPOSITION);

Answer 2

To implement the new Angular Http, you can follow the code snippet below in your Service.

  downloadFile(): Observable<HttpResponse<Blob>> {
    return this.http.get<Blob>(this.someURL, {
      observe: 'response',
      responseType: 'blob' as 'json'
    });
  }

Then, you can utilize the above function like this

 this.someService
  .downloadFile()
  .subscribe(
    (response: HttpResponse<Blob>) => {
      console.log(response.headers.get('content-disposition'));
      data = response.body
    });

Additionally, on the backend, it is important to include the following header in the response object:

'Access-Control-Expose-Headers': 'Content-Disposition'

Similarly, in Java Spring Boot, you can achieve the same functionality by using the code below

    final HttpHeaders headers = new HttpHeaders();
    headers.add(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=1.xlsx");
    headers.add(HttpHeaders.ACCESS_CONTROL_EXPOSE_HEADERS, HttpHeaders.CONTENT_DISPOSITION);

Answer 3

Answer №2

If you're facing issues with the best solution not working and only seeing content-type in the headers, the key is to set 'Access-Control-Expose-Headers' to 'Content-Disposition' on the server side. In my case using asp.net core, here's what I had to do:

app.UseCors(builder =>
                builder.WithOrigins(originsAllowed.ToArray())
                    .AllowAnyMethod()
                    .AllowAnyHeader()
                    .WithExposedHeaders("Content-Disposition")

Answer 4

If you're facing issues with the best solution not working and only seeing content-type in the headers, the key is to set 'Access-Control-Expose-Headers' to 'Content-Disposition' on the server side. In my case using asp.net core, here's what I had to do:

app.UseCors(builder =>
                builder.WithOrigins(originsAllowed.ToArray())
                    .AllowAnyMethod()
                    .AllowAnyHeader()
                    .WithExposedHeaders("Content-Disposition")

Answer 5

Answer №3

When working with Angular, obtaining the File Name can be achieved with the following code snippet:

  this.http.post(URL, DATA).subscribe(
        (res) => {
            var contentDisposition = res.headers.get('content-disposition');
            var filename = contentDisposition.split(';')[1].split('filename')[1].split('=')[1].trim();
            console.log(filename);
        });

However, it is crucial to remember to include Access-Control-Expose-Header in the API as demonstrated below:

Note: The inclusion of the last line is essential

FileInfo file = new FileInfo(FILEPATH);

HttpResponseMessage response = new HttpResponseMessage(HttpStatusCode.OK);
response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
{
    FileName = file.Name
};
response.Content.Headers.Add("Access-Control-Expose-Headers", "Content-Disposition");

Answer 6

When working with Angular, obtaining the File Name can be achieved with the following code snippet:

  this.http.post(URL, DATA).subscribe(
        (res) => {
            var contentDisposition = res.headers.get('content-disposition');
            var filename = contentDisposition.split(';')[1].split('filename')[1].split('=')[1].trim();
            console.log(filename);
        });

However, it is crucial to remember to include Access-Control-Expose-Header in the API as demonstrated below:

Note: The inclusion of the last line is essential

FileInfo file = new FileInfo(FILEPATH);

HttpResponseMessage response = new HttpResponseMessage(HttpStatusCode.OK);
response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
{
    FileName = file.Name
};
response.Content.Headers.Add("Access-Control-Expose-Headers", "Content-Disposition");

Answer 7

Answer №4

Feel free to experiment with this code snippet.

Take note: Avoid utilizing the map function.

this.ajax.sendRequest(URL, DATA)
  .response((res) => {
     var headers = res.headers;
     console.log(headers); //<--- Ensure to check the log for content disposition
     var contentDisposition = headers.get('content-disposition');
});

Answer 8

Feel free to experiment with this code snippet.

Take note: Avoid utilizing the map function.

this.ajax.sendRequest(URL, DATA)
  .response((res) => {
     var headers = res.headers;
     console.log(headers); //<--- Ensure to check the log for content disposition
     var contentDisposition = headers.get('content-disposition');
});

Answer 9

Answer №5

Using Angular 9 with Express

Make sure to include this header in your Express server

res.setHeader('Access-Control-Expose-Headers', 'Content-Disposition');

Angular HTTP Request

this.http.get(url, { observe: 'response', responseType: 'blob' as 'json' })
.subscribe((res: any) => {
    console.log(res.headers.get('content-disposition'));
});

Answer 10

Using Angular 9 with Express

Make sure to include this header in your Express server

res.setHeader('Access-Control-Expose-Headers', 'Content-Disposition');

Angular HTTP Request

this.http.get(url, { observe: 'response', responseType: 'blob' as 'json' })
.subscribe((res: any) => {
    console.log(res.headers.get('content-disposition'));
});

Answer 11

Answer №6

If you're working with Angular 7 and the up-voted method isn't functioning properly, you'll want to approach it using the following code:

const responseHeaderFilename = response.headers.get('content-disposition');

Be sure to refer to the official Angular documentation for more comprehensive information: https://angular.io/guide/http#reading-the-full-response

Additionally, ensure that the "Content-Disposition" is exposed as demonstrated in @mslugx's response.

Answer 12

If you're working with Angular 7 and the up-voted method isn't functioning properly, you'll want to approach it using the following code:

const responseHeaderFilename = response.headers.get('content-disposition');

Be sure to refer to the official Angular documentation for more comprehensive information: https://angular.io/guide/http#reading-the-full-response

Additionally, ensure that the "Content-Disposition" is exposed as demonstrated in @mslugx's response.

Answer 13

Answer №7

Extracting the filename from a response header.

(data)=>{  //the 'data' represents the response containing file data with the responseType: ResponseContentType.Blob.
    let filename = data.headers.get('content-disposition').split(';')[1].split('=')[1].replace(/\"/g, '')
}

Answer 14

Extracting the filename from a response header.

(data)=>{  //the 'data' represents the response containing file data with the responseType: ResponseContentType.Blob.
    let filename = data.headers.get('content-disposition').split(';')[1].split('=')[1].replace(/\"/g, '')
}

Answer 15

Answer №8

When it comes to CORS requests, they only reveal a limited number of headers:

Cache-Control
Content-Language
Content-Type Expires
Last-Modified & Pragma.

To access custom headers using CORS, server must explicitly whitelist them. This can be accomplished by setting the response header: Access-Control-Expose-Headers

For Java: addExposedHeader https://docs.spring.io/spring-framework/docs/4.2.x/javadoc-api/org/springframework/web/cors/CorsConfiguration.html

.NET CORE: WithExposedHeaders https://learn.microsoft.com/en-us/aspnet/core/security/cors?view=aspnetcore-6.0

For Express JS: exposedHeaders https://expressjs.com/en/resources/middleware/cors.html

Answer 16

When it comes to CORS requests, they only reveal a limited number of headers:

Cache-Control
Content-Language
Content-Type Expires
Last-Modified & Pragma.

To access custom headers using CORS, server must explicitly whitelist them. This can be accomplished by setting the response header: Access-Control-Expose-Headers

For Java: addExposedHeader https://docs.spring.io/spring-framework/docs/4.2.x/javadoc-api/org/springframework/web/cors/CorsConfiguration.html

.NET CORE: WithExposedHeaders https://learn.microsoft.com/en-us/aspnet/core/security/cors?view=aspnetcore-6.0

For Express JS: exposedHeaders https://expressjs.com/en/resources/middleware/cors.html

Answer 17

Answer №9

Code snippet for handling file name parsing in Angular 12.

const handleFileDownload = (response: HttpResponse<Blob>, defaultName = 'NoName.pdf') => {
  const fileName = response.headers
    .get('content-disposition')
    .split(';')
    .map(h => h.trim())
    .filter(h => h.startsWith('filename='))
    .reduce(h => h.length === 1 ? h[0] : defaultName)
    .replace('filename=', '');
  saveAs(response.body, fileName);
};

this.http.post(`./api/ReportPdf`, request, {observe: 'response', responseType: 'blob'}).subscribe({
    next: r => handleFileDownload(r)
});

Answer 18

Code snippet for handling file name parsing in Angular 12.

const handleFileDownload = (response: HttpResponse<Blob>, defaultName = 'NoName.pdf') => {
  const fileName = response.headers
    .get('content-disposition')
    .split(';')
    .map(h => h.trim())
    .filter(h => h.startsWith('filename='))
    .reduce(h => h.length === 1 ? h[0] : defaultName)
    .replace('filename=', '');
  saveAs(response.body, fileName);
};

this.http.post(`./api/ReportPdf`, request, {observe: 'response', responseType: 'blob'}).subscribe({
    next: r => handleFileDownload(r)
});

`How can I extract content-disposition headers from an Angular 2 server response?`

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

Answer №7

Answer №8

Answer №9

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