upload_progress_jsonp_output
The `upload_progress_jsonp_output` directive enables JSONP support for upload progress responses in NGINX.
Description
The upload_progress_jsonp_output directive is part of the NGINX upload progress tracking module, which allows for monitoring the progress of file uploads via POST requests. This directive specifically configures the upload progress reporting mechanism to use JSONP format, making it easier to integrate with web applications that require asynchronous updates about the upload status. By enabling this directive, developers can utilize a JavaScript callback function to handle the upload progress response directly, allowing for seamless updates to user interfaces without cross-origin issues.
The directive must be placed in contexts such as http, server, or location. Once enabled, it functions alongside other directive configurations within the upload progress module, ensuring that upload progress responses are formatted correctly for JSONP handling. The use of JSONP is particularly beneficial in scenarios where browser security policies prevent direct calls to a different domain, thereby enhancing compatibility with modern web applications.
This directive does not take any arguments, which simplifies its configuration. If both upload_progress_jsonp_output and its non-JSONP counterparts are used within the same context, care should be taken to avoid conflicts in output format as NGINX will generate error responses if it detects conflicting configurations.
Config Example
location /upload {
upload_progress jsonp_output;
track_uploads $upload_progress_zone 30s;
}
location /upload_progress {
# Respond to upload progress requests
upload_progress_jsonp_output;
}Ensure that the JavaScript callback function is correctly specified in the request to parse the JSONP output properly.
Be aware that using JSONP may expose the application to XSS risks if not properly validated.
Avoid enabling this directive alongside other output formats unless carefully managed, as it could lead to inconsistent response formats.