6

我维护的网站有时会在某些资源上收到失败的 GET 请求。状态返回为 (failed),类型为 Pending。标头仅包含请求本身,没有任何响应。

服务器正在运行 Drupal 和 Varnish。

关于导致失败的原因或从哪里开始调试的任何想法?

Chrome 开发工具中的 GET 请求失败

这可能与Chrome 在“Status = (failed)”和“Type = undefined”时遇到什么样的网络错误有关,即使类型返回不同的消息。有人可以证实这一点吗?如果是这样,我该如何调试呢?

提前致谢

编辑,我刚刚安装了wireshark 来尝试调试更多。

这是失败请求的全部后续内容

Wireshark 截图

94645、94651、94686 和 94688 的转储

No.     Time        Source                Destination           Protocol Length Info
  94645 211.219995  192.168.0.101         85.134.37.196         HTTP     1192   [TCP Retransmission] GET /sites/default/files/css/css_4PXz_aZSHtm7FWHqYsMdm7sl9C4802BFn9tXlePfpJU.css HTTP/1.1 

Frame 94645: 1192 bytes on wire (9536 bits), 1192 bytes captured (9536 bits)
    Arrival Time: Nov  7, 2012 22:55:18.002267000 EET
    Epoch Time: 1352321718.002267000 seconds
    [Time delta from previous captured frame: 0.006199000 seconds]
    [Time delta from previous displayed frame: 0.815800000 seconds]
    [Time since reference or first frame: 211.219995000 seconds]
    Frame Number: 94645
    Frame Length: 1192 bytes (9536 bits)
    Capture Length: 1192 bytes (9536 bits)
    [Frame is marked: True]
    [Frame is ignored: False]
    [Protocols in frame: eth:ip:tcp:http]
    [Coloring Rule Name: Bad TCP]
    [Coloring Rule String: tcp.analysis.flags]
Ethernet II, Src: HonHaiPr_e7:39:2f (38:59:f9:e7:39:2f), Dst: D-LinkIn_2f:a4:a4 (14:d6:4d:2f:a4:a4)
    Destination: D-LinkIn_2f:a4:a4 (14:d6:4d:2f:a4:a4)
        Address: D-LinkIn_2f:a4:a4 (14:d6:4d:2f:a4:a4)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
    Source: HonHaiPr_e7:39:2f (38:59:f9:e7:39:2f)
        Address: HonHaiPr_e7:39:2f (38:59:f9:e7:39:2f)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
    Type: IP (0x0800)
Internet Protocol Version 4, Src: 192.168.0.101 (192.168.0.101), Dst: 85.134.37.196 (85.134.37.196)
    Version: 4
    Header length: 20 bytes
    Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00: Not-ECT (Not ECN-Capable Transport))
        0000 00.. = Differentiated Services Codepoint: Default (0x00)
        .... ..00 = Explicit Congestion Notification: Not-ECT (Not ECN-Capable Transport) (0x00)
    Total Length: 1178
    Identification: 0x4e23 (20003)
    Flags: 0x02 (Don't Fragment)
        0... .... = Reserved bit: Not set
        .1.. .... = Don't fragment: Set
        ..0. .... = More fragments: Not set
    Fragment offset: 0
    Time to live: 64
    Protocol: TCP (6)
    Header checksum: 0xabe3 [correct]
        [Good: True]
        [Bad: False]
    Source: 192.168.0.101 (192.168.0.101)
    Destination: 85.134.37.196 (85.134.37.196)
Transmission Control Protocol, Src Port: 51714 (51714), Dst Port: http (80), Seq: 1, Ack: 1, Len: 1126
    Source port: 51714 (51714)
    Destination port: http (80)
    [Stream index: 5205]
    Sequence number: 1    (relative sequence number)
    [Next sequence number: 1127    (relative sequence number)]
    Acknowledgement number: 1    (relative ack number)
    Header length: 32 bytes
    Flags: 0x018 (PSH, ACK)
        000. .... .... = Reserved: Not set
        ...0 .... .... = Nonce: Not set
        .... 0... .... = Congestion Window Reduced (CWR): Not set
        .... .0.. .... = ECN-Echo: Not set
        .... ..0. .... = Urgent: Not set
        .... ...1 .... = Acknowledgement: Set
        .... .... 1... = Push: Set
        .... .... .0.. = Reset: Not set
        .... .... ..0. = Syn: Not set
        .... .... ...0 = Fin: Not set
    Window size value: 229
    [Calculated window size: 14656]
    [Window size scaling factor: 64]
    Checksum: 0xb15e [validation disabled]
        [Good Checksum: False]
        [Bad Checksum: False]
    Options: (12 bytes)
        No-Operation (NOP)
        No-Operation (NOP)
        Timestamps: TSval 30409363, TSecr 1723048723
            Kind: Timestamp (8)
            Length: 10
            Timestamp value: 30409363
            Timestamp echo reply: 1723048723
    [SEQ/ACK analysis]
        [Bytes in flight: 1126]
        [TCP Analysis Flags]
            [This frame is a (suspected) retransmission]
                [Expert Info (Note/Sequence): Retransmission (suspected)]
                    [Message: Retransmission (suspected)]
                    [Severity level: Note]
                    [Group: Sequence]
            [The RTO for this segment was: 1.480371000 seconds]
            [RTO based on delta from frame: 92823]
Hypertext Transfer Protocol
    GET /sites/default/files/css/css_4PXz_aZSHtm7FWHqYsMdm7sl9C4802BFn9tXlePfpJU.css HTTP/1.1\r\n
        [Expert Info (Chat/Sequence): GET /sites/default/files/css/css_4PXz_aZSHtm7FWHqYsMdm7sl9C4802BFn9tXlePfpJU.css HTTP/1.1\r\n]
            [Message: GET /sites/default/files/css/css_4PXz_aZSHtm7FWHqYsMdm7sl9C4802BFn9tXlePfpJU.css HTTP/1.1\r\n]
            [Severity level: Chat]
            [Group: Sequence]
        Request Method: GET
        Request URI: /sites/default/files/css/css_4PXz_aZSHtm7FWHqYsMdm7sl9C4802BFn9tXlePfpJU.css
        Request Version: HTTP/1.1
    Host: www.snellman.fi\r\n
    Connection: keep-alive\r\n
    User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.4 (KHTML, like Gecko) Chrome/22.0.1229.94 Safari/537.4\r\n
    Accept: text/css,*/*;q=0.1\r\n
    Referer: http://www.snellman.fi/sv\r\n
    Accept-Encoding: gzip,deflate,sdch\r\n
    Accept-Language: en-US,en;q=0.8\r\n
    Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3\r\n
    [truncated] Cookie: v_tid=82524dc4552b4cd4a22d1fa4e7e78d72; Drupal.toolbar.collapsed=0; ctools-collapsible-state=views-ui-advanced-column-uusimmat_reseptit%3A1%2Cviews-ui-advanced-column-Related%3A1; Drupal.tableDrag.showWeight=0; SESS4049
    \r\n
    [Full request URI: http://www.snellman.fi/sites/default/files/css/css_4PXz_aZSHtm7FWHqYsMdm7sl9C4802BFn9tXlePfpJU.css]

---------------------------------------------------------------------------------------------------------------------------------------------------------

No.     Time        Source                Destination           Protocol Length Info
  94651 211.228592  85.134.37.196         192.168.0.101         TCP      66     [TCP Dup ACK 92860#3] http > 51714 [ACK] Seq=1 Ack=1 Win=14592 Len=0 TSval=1723049571 TSecr=1723044620

Frame 94651: 66 bytes on wire (528 bits), 66 bytes captured (528 bits)
    Arrival Time: Nov  7, 2012 22:55:18.010864000 EET
    Epoch Time: 1352321718.010864000 seconds
    [Time delta from previous captured frame: 0.001166000 seconds]
    [Time delta from previous displayed frame: 0.008597000 seconds]
    [Time since reference or first frame: 211.228592000 seconds]
    Frame Number: 94651
    Frame Length: 66 bytes (528 bits)
    Capture Length: 66 bytes (528 bits)
    [Frame is marked: True]
    [Frame is ignored: False]
    [Protocols in frame: eth:ip:tcp]
    [Coloring Rule Name: Bad TCP]
    [Coloring Rule String: tcp.analysis.flags]
Ethernet II, Src: D-LinkIn_2f:a4:a4 (14:d6:4d:2f:a4:a4), Dst: HonHaiPr_e7:39:2f (38:59:f9:e7:39:2f)
    Destination: HonHaiPr_e7:39:2f (38:59:f9:e7:39:2f)
        Address: HonHaiPr_e7:39:2f (38:59:f9:e7:39:2f)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
    Source: D-LinkIn_2f:a4:a4 (14:d6:4d:2f:a4:a4)
        Address: D-LinkIn_2f:a4:a4 (14:d6:4d:2f:a4:a4)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
    Type: IP (0x0800)
Internet Protocol Version 4, Src: 85.134.37.196 (85.134.37.196), Dst: 192.168.0.101 (192.168.0.101)
    Version: 4
    Header length: 20 bytes
    Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00: Not-ECT (Not ECN-Capable Transport))
        0000 00.. = Differentiated Services Codepoint: Default (0x00)
        .... ..00 = Explicit Congestion Notification: Not-ECT (Not ECN-Capable Transport) (0x00)
    Total Length: 52
    Identification: 0x8b62 (35682)
    Flags: 0x02 (Don't Fragment)
        0... .... = Reserved bit: Not set
        .1.. .... = Don't fragment: Set
        ..0. .... = More fragments: Not set
    Fragment offset: 0
    Time to live: 58
    Protocol: TCP (6)
    Header checksum: 0x790a [correct]
        [Good: True]
        [Bad: False]
    Source: 85.134.37.196 (85.134.37.196)
    Destination: 192.168.0.101 (192.168.0.101)
Transmission Control Protocol, Src Port: http (80), Dst Port: 51714 (51714), Seq: 1, Ack: 1, Len: 0
    Source port: http (80)
    Destination port: 51714 (51714)
    [Stream index: 5205]
    Sequence number: 1    (relative sequence number)
    Acknowledgement number: 1    (relative ack number)
    Header length: 32 bytes
    Flags: 0x010 (ACK)
        000. .... .... = Reserved: Not set
        ...0 .... .... = Nonce: Not set
        .... 0... .... = Congestion Window Reduced (CWR): Not set
        .... .0.. .... = ECN-Echo: Not set
        .... ..0. .... = Urgent: Not set
        .... ...1 .... = Acknowledgement: Set
        .... .... 0... = Push: Not set
        .... .... .0.. = Reset: Not set
        .... .... ..0. = Syn: Not set
        .... .... ...0 = Fin: Not set
    Window size value: 114
    [Calculated window size: 14592]
    [Window size scaling factor: 128]
    Checksum: 0xd246 [validation disabled]
        [Good Checksum: False]
        [Bad Checksum: False]
    Options: (12 bytes)
        No-Operation (NOP)
        No-Operation (NOP)
        Timestamps: TSval 1723049571, TSecr 1723044620
            Kind: Timestamp (8)
            Length: 10
            Timestamp value: 1723049571
            Timestamp echo reply: 1723044620
    [SEQ/ACK analysis]
        [TCP Analysis Flags]
            [This is a TCP duplicate ack]
        [Duplicate ACK #: 3]
        [Duplicate to the ACK in frame: 92860]
            [Expert Info (Note/Sequence): Duplicate ACK (#3)]
                [Message: Duplicate ACK (#3)]
                [Severity level: Note]
                [Group: Sequence]

---------------------------------------------------------------------------------------------------------------------------------------------------------

No.     Time        Source                Destination           Protocol Length Info
  94686 211.305208  85.134.37.196         192.168.0.101         TCP      66     http > 51714 [FIN, ACK] Seq=1 Ack=1 Win=14592 Len=0 TSval=1723049647 TSecr=1723044620

Frame 94686: 66 bytes on wire (528 bits), 66 bytes captured (528 bits)
    Arrival Time: Nov  7, 2012 22:55:18.087480000 EET
    Epoch Time: 1352321718.087480000 seconds
    [Time delta from previous captured frame: 0.000026000 seconds]
    [Time delta from previous displayed frame: 0.076616000 seconds]
    [Time since reference or first frame: 211.305208000 seconds]
    Frame Number: 94686
    Frame Length: 66 bytes (528 bits)
    Capture Length: 66 bytes (528 bits)
    [Frame is marked: True]
    [Frame is ignored: False]
    [Protocols in frame: eth:ip:tcp]
    [Coloring Rule Name: HTTP]
    [Coloring Rule String: http || tcp.port == 80]
Ethernet II, Src: D-LinkIn_2f:a4:a4 (14:d6:4d:2f:a4:a4), Dst: HonHaiPr_e7:39:2f (38:59:f9:e7:39:2f)
    Destination: HonHaiPr_e7:39:2f (38:59:f9:e7:39:2f)
        Address: HonHaiPr_e7:39:2f (38:59:f9:e7:39:2f)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
    Source: D-LinkIn_2f:a4:a4 (14:d6:4d:2f:a4:a4)
        Address: D-LinkIn_2f:a4:a4 (14:d6:4d:2f:a4:a4)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
    Type: IP (0x0800)
Internet Protocol Version 4, Src: 85.134.37.196 (85.134.37.196), Dst: 192.168.0.101 (192.168.0.101)
    Version: 4
    Header length: 20 bytes
    Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00: Not-ECT (Not ECN-Capable Transport))
        0000 00.. = Differentiated Services Codepoint: Default (0x00)
        .... ..00 = Explicit Congestion Notification: Not-ECT (Not ECN-Capable Transport) (0x00)
    Total Length: 52
    Identification: 0x8b63 (35683)
    Flags: 0x02 (Don't Fragment)
        0... .... = Reserved bit: Not set
        .1.. .... = Don't fragment: Set
        ..0. .... = More fragments: Not set
    Fragment offset: 0
    Time to live: 58
    Protocol: TCP (6)
    Header checksum: 0x7909 [correct]
        [Good: True]
        [Bad: False]
    Source: 85.134.37.196 (85.134.37.196)
    Destination: 192.168.0.101 (192.168.0.101)
Transmission Control Protocol, Src Port: http (80), Dst Port: 51714 (51714), Seq: 1, Ack: 1, Len: 0
    Source port: http (80)
    Destination port: 51714 (51714)
    [Stream index: 5205]
    Sequence number: 1    (relative sequence number)
    Acknowledgement number: 1    (relative ack number)
    Header length: 32 bytes
    Flags: 0x011 (FIN, ACK)
        000. .... .... = Reserved: Not set
        ...0 .... .... = Nonce: Not set
        .... 0... .... = Congestion Window Reduced (CWR): Not set
        .... .0.. .... = ECN-Echo: Not set
        .... ..0. .... = Urgent: Not set
        .... ...1 .... = Acknowledgement: Set
        .... .... 0... = Push: Not set
        .... .... .0.. = Reset: Not set
        .... .... ..0. = Syn: Not set
        .... .... ...1 = Fin: Set
            [Expert Info (Chat/Sequence): Connection finish (FIN)]
                [Message: Connection finish (FIN)]
                [Severity level: Chat]
                [Group: Sequence]
    Window size value: 114
    [Calculated window size: 14592]
    [Window size scaling factor: 128]
    Checksum: 0xd1f9 [validation disabled]
        [Good Checksum: False]
        [Bad Checksum: False]
    Options: (12 bytes)
        No-Operation (NOP)
        No-Operation (NOP)
        Timestamps: TSval 1723049647, TSecr 1723044620
            Kind: Timestamp (8)
            Length: 10
            Timestamp value: 1723049647
            Timestamp echo reply: 1723044620

---------------------------------------------------------------------------------------------------------------------------------------------------------

No.     Time        Source                Destination           Protocol Length Info
  94688 211.305660  192.168.0.101         85.134.37.196         TCP      66     51714 > http [FIN, ACK] Seq=1127 Ack=2 Win=14656 Len=0 TSval=30409384 TSecr=1723049647

Frame 94688: 66 bytes on wire (528 bits), 66 bytes captured (528 bits)
    Arrival Time: Nov  7, 2012 22:55:18.087932000 EET
    Epoch Time: 1352321718.087932000 seconds
    [Time delta from previous captured frame: 0.000264000 seconds]
    [Time delta from previous displayed frame: 0.000452000 seconds]
    [Time since reference or first frame: 211.305660000 seconds]
    Frame Number: 94688
    Frame Length: 66 bytes (528 bits)
    Capture Length: 66 bytes (528 bits)
    [Frame is marked: True]
    [Frame is ignored: False]
    [Protocols in frame: eth:ip:tcp]
    [Coloring Rule Name: HTTP]
    [Coloring Rule String: http || tcp.port == 80]
Ethernet II, Src: HonHaiPr_e7:39:2f (38:59:f9:e7:39:2f), Dst: D-LinkIn_2f:a4:a4 (14:d6:4d:2f:a4:a4)
    Destination: D-LinkIn_2f:a4:a4 (14:d6:4d:2f:a4:a4)
        Address: D-LinkIn_2f:a4:a4 (14:d6:4d:2f:a4:a4)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
    Source: HonHaiPr_e7:39:2f (38:59:f9:e7:39:2f)
        Address: HonHaiPr_e7:39:2f (38:59:f9:e7:39:2f)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
    Type: IP (0x0800)
Internet Protocol Version 4, Src: 192.168.0.101 (192.168.0.101), Dst: 85.134.37.196 (85.134.37.196)
    Version: 4
    Header length: 20 bytes
    Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00: Not-ECT (Not ECN-Capable Transport))
        0000 00.. = Differentiated Services Codepoint: Default (0x00)
        .... ..00 = Explicit Congestion Notification: Not-ECT (Not ECN-Capable Transport) (0x00)
    Total Length: 52
    Identification: 0x4e24 (20004)
    Flags: 0x02 (Don't Fragment)
        0... .... = Reserved bit: Not set
        .1.. .... = Don't fragment: Set
        ..0. .... = More fragments: Not set
    Fragment offset: 0
    Time to live: 64
    Protocol: TCP (6)
    Header checksum: 0xb048 [correct]
        [Good: True]
        [Bad: False]
    Source: 192.168.0.101 (192.168.0.101)
    Destination: 85.134.37.196 (85.134.37.196)
Transmission Control Protocol, Src Port: 51714 (51714), Dst Port: http (80), Seq: 1127, Ack: 2, Len: 0
    Source port: 51714 (51714)
    Destination port: http (80)
    [Stream index: 5205]
    Sequence number: 1127    (relative sequence number)
    Acknowledgement number: 2    (relative ack number)
    Header length: 32 bytes
    Flags: 0x011 (FIN, ACK)
        000. .... .... = Reserved: Not set
        ...0 .... .... = Nonce: Not set
        .... 0... .... = Congestion Window Reduced (CWR): Not set
        .... .0.. .... = ECN-Echo: Not set
        .... ..0. .... = Urgent: Not set
        .... ...1 .... = Acknowledgement: Set
        .... .... 0... = Push: Not set
        .... .... .0.. = Reset: Not set
        .... .... ..0. = Syn: Not set
        .... .... ...1 = Fin: Set
            [Expert Info (Chat/Sequence): Connection finish (FIN)]
                [Message: Connection finish (FIN)]
                [Severity level: Chat]
                [Group: Sequence]
    Window size value: 229
    [Calculated window size: 14656]
    [Window size scaling factor: 64]
    Checksum: 0x3c7e [validation disabled]
        [Good Checksum: False]
        [Bad Checksum: False]
    Options: (12 bytes)
        No-Operation (NOP)
        No-Operation (NOP)
        Timestamps: TSval 30409384, TSecr 1723049647
            Kind: Timestamp (8)
            Length: 10
            Timestamp value: 30409384
            Timestamp echo reply: 1723049647
    [SEQ/ACK analysis]
        [This is an ACK to the segment in frame: 94686]
        [The RTT to ACK the segment was: 0.000452000 seconds]
4

3 回答 3

2

就我而言,Adblock 拒绝了该请求(因为这是一个 Twitter 请求,而我屏蔽了大多数 Twitter 内容)。

于 2013-10-29T19:09:49.350 回答
1

通过从 Varnish 3.0.2 升级到 3.0.3 解决了我的具体问题。

于 2013-03-27T16:08:23.183 回答
1

我在 Chrome 中遇到了这个确切的问题,对我来说,是离线缓存造成了麻烦。

我有一个 asp.net html5 应用程序,专为具有离线支持的移动使用而设计。所以我有这样的清单属性:

<html manifest="Manifest.ashx">

而且我有一个 ashx 处理程序,它可以动态地为清单文件提供服务。为了开发,我删除了主页上的清单属性,但我有另一个很少使用的页面,它具有清单属性。项目中的最新文件(一个图像和两个 js 文件)尚未添加到清单中。当我访问另一个页面并返回主页时,清单中缺少的文件开始在日志中失败,没有友好的错误消息,只需键入:挂起和“失败”。这只是在桌面上的 Chrome 上测试,没有离线。

将文件添加到清单列表中解决了我的问题。

于 2013-01-24T08:34:22.723 回答