Adds cache control header and updates all existing headers to be lowercase for HTTP/2 (#498)
Adds cache control header and updates all existing headers to be lowercase for HTTP/2 (#498)


GoogleCloudPlatform/nodejs-docs-samples,GoogleCloudPlatform/nodejs-docs-samples,JustinBeckwith/nodejs-docs-samples,JustinBeckwith/nodejs-docs-samples,GoogleCloudPlatform/nodejs-docs-samples,JustinBeckwith/nodejs-docs-samples,GoogleCloudPlatform/nodejs-docs-samples