我有一个apache 2.4服务器，它提供一个名为resource.js的文件。
当我请求资源时，它返回一个旧页面。我的浏览器不会在请求中发送ETAG或Last-Modified标头，可能是因为它没有缓存此资源。 这是发生这种情况时HAR的片段
{
"startedDateTime": "2014-04-30T21:01:36.384Z",
"time": 0,
"request": {
"method": "GET",
"url": "https://someserver/resource.js",
"headers": [
{
"name": "User-Agent",
"value": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/34.0.1847.131 Safari/537.36"
}
],
"queryString": [],
"cookies": [],
"headersSize": -1,
"bodySize": 0
},
"response": {
"status": 200,
"statusText": "OK",
"httpVersion": "HTTP/1.1",
"headers": [
{
"name": "Date",
"value": "Wed, 30 Apr 2014 20:46:57 GMT"
},
{
"name": "Last-Modified",
"value": "Thu, 24 Apr 2014 23:42:51 GMT"
},
{
"name": "Server",
"value": "Apache/2.4.4 (Unix) OpenSSL/1.0.1 PHP/5.4.12"
},
{
"name": "ETag",
"value": "\"e00-4f7d2684c7fb9\""
},
{
"name": "Content-Type",
"value": "application/javascript"
},
{
"name": "Connection",
"value": "Keep-Alive"
},
{
"name": "Accept-Ranges",
"value": "bytes"
},
{
"name": "Keep-Alive",
"value": "timeout=5, max=98"
},
{
"name": "Content-Length",
"value": "3584"
}
],
"cookies": [],
"content": {
"size": 3584,
"mimeType": "application/javascript",
"text": "...."
},
"redirectURL": "",
"headersSize": 318,
"bodySize": 0
},
"cache": {},
"timings": {
"blocked": -1,
"dns": -1,
"connect": -1,
"send": 0,
"wait": 0,
"receive": 0,
"ssl": -1
},
"connection": "48540",
"pageref": "page_1"
},
我知道这是一个旧页面，因为我可以验证页面的内容不是服务器上的内容。另请注意，当我今天修改此文件时，响应会返回一个ETAG（这是错误的）和一个7天前的Last-Modified日期。
在后续请求中，在作为请求的一部分提交ETAG和Last-Modified标头之后，apache服务器返回正确的页面：
{
"startedDateTime": "2014-04-30T21:03:02.771Z",
"time": 490.7269477844238,
"request": {
"method": "GET",
"url": "https://someserver/resource.js",
"httpVersion": "HTTP/1.1",
"headers": [
{
"name": "Cookie",
"value": "__utma=37592696.1580400495.1393617937.1393617937.1394060568.2; __utmz=37592696.1393617937.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); m=1933:60%7C5|2491:chart|34e2:|4e71:small"
},
{
"name": "Accept-Encoding",
"value": "gzip,deflate,sdch"
},
{
"name": "Host",
"value": "someserver"
},
{
"name": "Accept-Language",
"value": "en-US,en;q=0.8"
},
{
"name": "User-Agent",
"value": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/34.0.1847.131 Safari/537.36"
},
{
"name": "Accept",
"value": "*/*"
},
{
"name": "Cache-Control",
"value": "max-age=0"
},
{
"name": "If-None-Match",
"value": "\"e00-4f7d2684c7fb9\""
},
{
"name": "Connection",
"value": "keep-alive"
},
{
"name": "If-Modified-Since",
"value": "Thu, 24 Apr 2014 23:42:51 GMT"
},
{
"name": "Referer",
"value": "https://someserver"
}
],
"queryString": [],
"cookies": [
{
"name": "__utma",
"value": "37592696.1580400495.1393617937.1393617937.1394060568.2",
"expires": null,
"httpOnly": false,
"secure": false
},
{
"name": "__utmz",
"value": "37592696.1393617937.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none)",
"expires": null,
"httpOnly": false,
"secure": false
},
{
"name": "m",
"value": "1933:60%7C5|2491:chart|34e2:|4e71:small",
"expires": null,
"httpOnly": false,
"secure": false
}
],
"headersSize": 667,
"bodySize": 0
},
"response": {
"status": 200,
"statusText": "OK",
"httpVersion": "HTTP/1.1",
"headers": [
{
"name": "Date",
"value": "Wed, 30 Apr 2014 21:03:03 GMT"
},
{
"name": "Last-Modified",
"value": "Wed, 30 Apr 2014 21:01:19 GMT"
},
{
"name": "Server",
"value": "Apache/2.4.4 (Unix) OpenSSL/1.0.1 PHP/5.4.12"
},
{
"name": "ETag",
"value": "\"8bd-4f848d99ceae4\""
},
{
"name": "Content-Type",
"value": "application/javascript"
},
{
"name": "Connection",
"value": "Keep-Alive"
},
{
"name": "Accept-Ranges",
"value": "bytes"
},
{
"name": "Keep-Alive",
"value": "timeout=5, max=100"
},
{
"name": "Content-Length",
"value": "2237"
}
],
"cookies": [],
"content": {
"size": 2237,
"mimeType": "application/javascript",
"compression": 0,
"text": "..."
},
"redirectURL": "",
"headersSize": 321,
"bodySize": 2237
},
"cache": {},
"timings": {
"blocked": 2.418000000034226,
"dns": 69.07200000023295,
"connect": 182.09600000045612,
"send": 0.08100000013655517,
"wait": 235.99800000010873,
"receive": 1.0619477834552526,
"ssl": 181.40800000037416
},
"connection": "49670",
"pageref": "page_2"
},
正如预期的那样，在第3个请求中，ETAG和Last-Modified都很好，因此apache服务器发回304响应代码：
{
"startedDateTime": "2014-04-30T21:14:56.248Z",
"time": 138.21721076965332,
"request": {
"method": "GET",
"url": "https://someserver/resource.js",
"httpVersion": "HTTP/1.1",
"headers": [
{
"name": "If-None-Match",
"value": "\"8bd-4f848d99ceae4\""
},
{
"name": "Accept-Encoding",
"value": "gzip,deflate,sdch"
},
{
"name": "Host",
"value": "someserver"
},
{
"name": "Accept-Language",
"value": "en-US,en;q=0.8"
},
{
"name": "User-Agent",
"value": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/34.0.1847.131 Safari/537.36"
},
{
"name": "Accept",
"value": "*/*"
},
{
"name": "Referer",
"value": "https://someserver"
},
{
"name": "Cookie",
"value": "__utma=37592696.1580400495.1393617937.1393617937.1394060568.2; __utmz=37592696.1393617937.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); m=1933:60%7C5|2491:chart|34e2:|4e71:small"
},
{
"name": "Connection",
"value": "keep-alive"
},
{
"name": "If-Modified-Since",
"value": "Wed, 30 Apr 2014 21:01:19 GMT"
}
],
"queryString": [],
"cookies": [
{
"name": "__utma",
"value": "37592696.1580400495.1393617937.1393617937.1394060568.2",
"expires": null,
"httpOnly": false,
"secure": false
},
{
"name": "__utmz",
"value": "37592696.1393617937.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none)",
"expires": null,
"httpOnly": false,
"secure": false
},
{
"name": "m",
"value": "1933:60%7C5|2491:chart|34e2:|4e71:small",
"expires": null,
"httpOnly": false,
"secure": false
}
],
"headersSize": 653,
"bodySize": 0
},
"response": {
"status": 304,
"statusText": "Not Modified",
"httpVersion": "HTTP/1.1",
"headers": [
{
"name": "Date",
"value": "Wed, 30 Apr 2014 21:14:56 GMT"
},
{
"name": "ETag",
"value": "\"8bd-4f848d99ceae4\""
},
{
"name": "Server",
"value": "Apache/2.4.4 (Unix) OpenSSL/1.0.1 PHP/5.4.12"
},
{
"name": "Connection",
"value": "Keep-Alive"
},
{
"name": "Keep-Alive",
"value": "timeout=5, max=100"
}
],
"cookies": [],
"content": {
"size": 2237,
"mimeType": "application/javascript",
"text": "..."
},
"redirectURL": "",
"headersSize": 203,
"bodySize": 0
},
"cache": {},
"timings": {
"blocked": 5.732999999963795,
"dns": -1,
"connect": -1,
"send": 0.07100000038917642,
"wait": 118.89599999994971,
"receive": 13.51721076935064,
"ssl": -1
},
"connection": "51334",
"pageref": "page_1"
},
如果有人知道为什么第一个请求返回了错误的页面，请告诉我。