Server call image from WebAPI

Question

I have a intranet WebAPI server which provides services for a DMZ(internet) Server.

API actions:

[HttpGet] public HttpResponseMessage ImagePath(string filePath) { var result = new HttpResponseMessage(HttpStatusCode.OK); FileStream fileStream = new FileStream(filePath, FileMode.Open); Image image = Image.FromStream(fileStream); MemoryStream memoryStream = new MemoryStream(); image.Save(memoryStream, ImageFormat.Jpeg); result.Content = new ByteArrayContent(memoryStream.ToArray()); result.Content.Headers.ContentType = new MediaTypeHeaderValue("image/jpeg"); return result; }

The api does return an image sucessfully. I want to proceed a request from DMZ to intranet, but I don't know how to write the action, my code below:

public async Task<HttpResponseMessage> ImagePath(string filePath) { HttpClientHandler handler = new HttpClientHandler() { UseDefaultCredentials = true, }; using (var client = new HttpClient(handler)) { client.BaseAddress = new Uri(apiUrl); //apiUrl is my intranet domain client.DefaultRequestHeaders.Accept.Clear(); client.DefaultRequestHeaders.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("image/jpeg")); HttpResponseMessage fs = await client.GetAsync("cipap/api/baseapi/ImagePath?filePath=" + filePath); return fs; } //FileStream fs = new FileStream(filePath, FileMode.Open); //return File(fs, "image/jpeg"); }

Could somebody help me? Thanks a lot.

Community · Accepted Answer · 2017-05-23 10:28:38Z

I finally found the anwser ,
just make the action of a FileResult type, and return a file by:

File(fs.Content.ReadAsByteArrayAsync().Result, "image/jpeg");

one more thing is that in the webapi action, I need to configure the filestream as below or the file will be locked after the first request:

FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read);

public async Task<FileResult> ImagePath(string filePath) { HttpClientHandler handler = new HttpClientHandler() { UseDefaultCredentials = true, }; using (var client = new HttpClient(handler)) { client.BaseAddress = new Uri(apiUrl); client.DefaultRequestHeaders.Accept.Clear(); client.DefaultRequestHeaders.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("image/jpeg")); HttpResponseMessage fs = await client.GetAsync("cipap/api/baseapi/ImagePath?filePath=" + filePath); return File(fs.Content.ReadAsByteArrayAsync().Result, "image/jpeg"); } }

ref: Download file prompt when using WebAPI HttpResponseMessage

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