upload_add_header
The upload_add_header directive adds custom headers to the HTTP response during a file upload process.
Description
The upload_add_header directive is utilized within the NGINX upload module to define additional HTTP headers that should be included in the response sent back to the client after a file upload. This directive allows for two arguments: the header name and its corresponding value. When processing a multipart/form-data file upload, NGINX can add these headers to provide metadata or assist in handling information relevant to the upload operation. Such custom headers may be useful for client applications to know how to further process or handle the uploaded data, such as indicating the status of the upload or providing additional reference information.
This directive can be utilized in multiple contexts including http, server, location, or within an if statement inside a location block. Its versatility allows developers to customize header outputs based on the specific location or conditions of the upload process. Importantly, headers added via upload_add_header are always added to a successful response, after all processing has completed for the upload request. Therefore, the placement and logic around this directive can greatly influence the outcome and behavior of the HTTP response that clients receive after attempting a file upload.
Config Example
location /upload {
upload_pass /upload_handler;
upload_add_header X-Upload-Status "Completed";
}Ensure that the headers you add do not conflict with existing headers.
Headers should be set appropriately to avoid security implications such as exposing sensitive information.
Use correct syntax for header values to prevent misconfiguration.