fix IE lowercase x-progress-id in XMLHttpRequest
fix IE lowercase x-progress-id in XMLHttpRequest

masterzen/nginx-upload-progress-module,perusio/nginx-upload-progress-module,gencer/nginx-upload-progress-module,masterzen/nginx-upload-progress-module,perusio/nginx-upload-progress-module,Tiger66639/nginx-upload-progress-module,Tiger66639/nginx-upload-progress-module,gencer/nginx-upload-progress-module