Question

我编写了一个程序来下载web api返回的pdf，word或txt文件，并且它运行正常。在服务器端，我使用了WebApi和客户端AngularJs。现在的问题是，我还需要来自api的文件名，为此我需要读取api返回的头文件。但是reponse.headers并不包含所有标题信息。以下是我的代码：

 [HttpGet]
 [Authorize]
    public HttpResponseMessage GetTranscript(string key, int format)
    {
        var badRequest = Request.CreateResponse(HttpStatusCode.OK, "Not a valid input."); //ResponseMessage(Request.CreateResponse(HttpStatusCode.BadRequest, "Not a valid input."));
        if (string.IsNullOrWhiteSpace(jiraTaskKey))
        {
            return badRequest;
        }

        string transcript = _mediaCaptionService.GetTranscript(UserId, key);

        string fileName = "transcript";
        var response = new HttpResponseMessage(HttpStatusCode.OK);

        if (format == (int)TranscriptFormat.PDF)
        {
            byte[] byteInfo = GeneratePDFTranscript(transcript);
            response.Content = new ByteArrayContent(byteInfo);
            response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
            fileName = fileName + ".pdf";
        }
        else if (format == (int)TranscriptFormat.TXT)
        {
            response.Content = new StringContent(transcript, System.Text.Encoding.UTF8, "text/plain");
            fileName = fileName + ".txt";
        }
        else if (format == (int)TranscriptFormat.WORD)
        {                
            string transcriptFontName = "Arial";
            byte[] byteInfo = GenerateWordTranscript(transcript, transcriptFontName);
            response.Content = new ByteArrayContent(byteInfo);
            response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
            fileName = fileName + ".doc";
        }
        else
        {
            return badRequest;
        }
        response.Content.Headers.Add("x-filename", fileName);
        response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment") {
            FileName = fileName
        };
        //response.Content.Headers.ContentDisposition.FileName = fileName;
        return response; //ResponseMessage(response);
    }

并在客户端

  function getTranscriptResult(method, apiUrl, data) {
        var deferred = $q.defer();
        $http({
            method: method,
            url: apiUrl,
            data: data,
            responseType: 'arraybuffer'

        }).success(function (data, status, headers, config) {
            debugger;
            var results = [];
            results.data = data;
            results.headers = headers();
            results.status = status;
            results.config = config;                
            deferred.resolve(results);

        }).error(function (error, status, headers, config) {
            deferred.reject(error);

        });
        return deferred.promise;
    }

但是当我把断点放在上面的代码中时，我得到了这个：

您能否告诉我我的代码中的问题在哪里，我无法获取文件名？如果您需要更多信息，请告诉我。

Answer 1

添加以下行后解决了我的问题。

// Add a custom header for filename and expose it to be consumed by JavaScript.
response.Content.Headers.Add("Filename", zipFileName);
response.Content.Headers.Add("Access-Control-Expose-Headers", "Filename");

因此，基本上添加 Access-Control-Expose-Headers 帮助我将自定义标头公开给客户端。有关详细信息，请参阅此link

无法将自定义标头从WebAPI公开给客户端

1 个答案: