After downloading the file does not open the default implementation

　In conventional HTTP response, Content-Disposition header indicating the contents of the reply to show in what form, is inline form (that is part of a web page or a page), or in the attachment downloaded and saved to a local form.

   As the body of the message header

　　In HTTP scenario, or the first argument is inline(the default value that represents the reply message to show experience in the form of a portion of or the entire page of the page), or attachment(means that the message body should be downloaded to the local; most browsers will show a "save as" dialog box, filenamethe value of the pre-filled name for the file after downloading, if it exists).

Disposition-the Content: inline 
the Content-Disposition: Attachment 
the Content-Disposition: Attachment; filename = "filename.jpg" 

production environment can be arranged directly nginx: 
LOCATION ~ ^ / S / {$ (*.) 
　　The add_header the Content-Disposition "Attachment ; filename = $ 1 "; // download does not open 
　　add_header Content-Disposition" inline; filename = $ 1 "; // download file is opened 
}