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[httpd] Allow browsers to cache static files

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Setting the response headers "Cache-Control" and "Last-Modified" results
in clients being able to cache the response. For a subsequent request
for the same file, the browser sets the request header
"If-Modified-Since" with the value from "Last-Modified" from the last
response. The server (httpd.c) checks if the file has been modified and
if not returns HTTP 304 Not Modified.
This commit is contained in:
chme 2017-08-29 23:12:46 +02:00
parent 5d5ed42749
commit f1e706ee8f
1 changed files with 23 additions and 3 deletions
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26
src/httpd.c
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@ -973,11 +973,15 @@ serve_file(struct evhttp_request *req, char *uri)
char *deref;
char *ctype;
struct evbuffer *evbuf;
struct evkeyvalq *headers;
struct evkeyvalq *input_headers;
struct evkeyvalq *output_headers;
struct stat sb;
int fd;
int i;
uint8_t buf[4096];
const char *modified_since;
char last_modified[1000];
struct tm *tm_modified;
int ret;
/* Check authentication */
@ -1069,6 +1073,18 @@ serve_file(struct evhttp_request *req, char *uri)
return;
}
tm_modified = gmtime(&sb.st_mtime);
strftime(last_modified, sizeof(last_modified), "%a, %d %b %Y %H:%M:%S %Z", tm_modified);
input_headers = evhttp_request_get_input_headers(req);
modified_since = evhttp_find_header(input_headers, "If-Modified-Since");
if (modified_since && strcasecmp(last_modified, modified_since) == 0)
{
httpd_send_reply(req, HTTP_NOTMODIFIED, NULL, NULL, HTTPD_SEND_NO_GZIP);
return;
}
evbuf = evbuffer_new();
if (!evbuf)
{
@ -1118,8 +1134,12 @@ serve_file(struct evhttp_request *req, char *uri)
}
}
headers = evhttp_request_get_output_headers(req);
evhttp_add_header(headers, "Content-Type", ctype);
output_headers = evhttp_request_get_output_headers(req);
evhttp_add_header(output_headers, "Content-Type", ctype);
// Allow browsers to cache the file
evhttp_add_header(output_headers, "Cache-Control", "private");
evhttp_add_header(output_headers, "Last-Modified", last_modified);
httpd_send_reply(req, HTTP_OK, "OK", evbuf, HTTPD_SEND_NO_GZIP);