Download file

[m-mattia-m]

Environment:
go version go1.19 darwin/arm64
swag version v1.8.10

I have created an API with Gin-Gonic where I can download a file. This file is transferred as a byte array. When I open the swagger, I get a success after executing the request and I can download the file. Now I have imported the Swagger doc file in the frontend and generated the API calls from it. But now when I send a request from the frontend I get a success in the network but when I download the file it is empty. Online I have seen that it can be because I have specified the wrong response type with Swaggo. Which response type is needed for a file download?

FileData is in Go a []byte which comes from the S3. As mentioned, I can also download it correctly in Postman and the SwaggerUI.

// GetFileByName 				        godoc
// @title           				                GetFileByName
// @description     				        get file by filename
// @Tags 						  	Submission
// @Param        					filename    path     string  true  "Filename"
// @Router  						/submission/file/{filename} [get]
// @Accept 						json
// @Produce 						application/octet-stream
// @Success 						200 string "The binary data of the requested file"
// @Error      						400  {object} models.Error
// @Security						Bearer
func GetFileByName(c *gin.Context) {
	c.Header("Content-Disposition", fmt.Sprintf("attachment; filename=%s", filename))
	c.Header("Content-Type", file.FileType)
	c.Header("Content-Length", file.FileSize)
	for key, value := range file.FileMeta {
		c.Header(key, *value)
	}
	c.Data(200, "application/octet-stream", file.FileData)
	return
}

I would now claim the problem is due to my configuration in the backend, since I have defined a string as the response type. If the problem is in the frontend, here is my code. I am using Vue with TypeScript and the Pinia store.

async loadFile(){
    let submissionsApi = new SubmissionApi(generateAxiosConfig());
    let fileResponse = await submissionsApi.submissionFileFilenameGet(this.submission.synopsis || "")
    console.log(fileResponse)
    const file = new Blob([fileResponse.data.toString()], { type: 'application/pdf' }); // 'application/octet-stream'
    const fileUrl = URL.createObjectURL(file);
    window.open(fileUrl, '_blank');
}