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Javascript 当多次调用api时，AJAX请求有时会被取消

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Javascript 当多次调用api时，AJAX请求有时会被取消,javascript,ajax,http,http-headers,content-security-policy,Javascript,Ajax,Http,Http Headers,Content Security Policy,在应用程序中，url通过ajax被调用了4次。由于某种原因，当在特定页面上第四次发出请求时，ajax请求被取消。 第四个请求的临时头显示在其请求头中，出于某种原因，应用程序不会发出与第四个请求类似的第五个请求 我能用它做一些挖掘chrome://net-internals. 下面我完整地复制了第三个和第四个请求，主要区别在于网络日志的HTTP_事务_读取_头部分。 以下是第4个请求中的全部数据。与其他3个请求不同，由于某种原因，它返回了302个请求- t=61558 [st= 0] +REQU

在应用程序中，url通过ajax被调用了4次。由于某种原因，当在特定页面上第四次发出请求时，ajax请求被取消。 第四个请求的临时头显示在其请求头中，出于某种原因，应用程序不会发出与第四个请求类似的第五个请求

我能用它做一些挖掘chrome://net-internals. 下面我完整地复制了第三个和第四个请求，主要区别在于网络日志的HTTP_事务_读取_头部分。 以下是第4个请求中的全部数据。与其他3个请求不同，由于某种原因，它返回了302个请求-

t=61558 [st=  0] +REQUEST_ALIVE  [dt=274]
                  --> priority = "MEDIUM"
                  --> url = "https://example.com/api/v1/track/login?time=1556662845627"
t=61559 [st=  1]    NETWORK_DELEGATE_BEFORE_URL_REQUEST  [dt=0]
t=61559 [st=  1]   +URL_REQUEST_START_JOB  [dt=273]
                    --> load_flags = 0 (NORMAL)
                    --> method = "POST"
                    --> privacy_mode = 0
                    --> upload_id = "0"
                    --> url = "https://example.com/api/v1/track/login?time=1556662845627"
t=61559 [st=  1]      NETWORK_DELEGATE_BEFORE_START_TRANSACTION  [dt=0]
t=61559 [st=  1]      HTTP_CACHE_GET_BACKEND  [dt=0]
t=61559 [st=  1]     +HTTP_STREAM_REQUEST  [dt=0]
t=61559 [st=  1]        HTTP_STREAM_JOB_CONTROLLER_BOUND
                        --> source_dependency = 1619753 (HTTP_STREAM_JOB_CONTROLLER)
t=61559 [st=  1]        HTTP_STREAM_REQUEST_BOUND_TO_JOB
                        --> source_dependency = 1619754 (HTTP_STREAM_JOB)
t=61559 [st=  1]     -HTTP_STREAM_REQUEST
t=61559 [st=  1]      UPLOAD_DATA_STREAM_INIT  [dt=0]
                      --> is_chunked = false
                      --> net_error = 0 (?)
                      --> total_size = 112
t=61559 [st=  1]     +HTTP_TRANSACTION_SEND_REQUEST  [dt=1]
t=61559 [st=  1]        HTTP_TRANSACTION_HTTP2_SEND_REQUEST_HEADERS
                        --> :method: POST
                            :authority: example.com
                            :scheme: https
                            :path: /api/v1/track/login?time=1556662845627
                            content-length: 112
                            accept: application/json, text/javascript, */*; q=0.01
                            origin: https://example.com
                            x-requested-with: XMLHttpRequest
                            user-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.103 Safari/537.36
                            content-type: application/x-www-form-urlencoded; charset=UTF-8
                            referer: https://example.com/index.php
                            accept-encoding: gzip, deflate, br
                            accept-language: en-US,en;q=0.9
                            cookie: [1570 bytes were stripped]
t=61560 [st=  2]        UPLOAD_DATA_STREAM_READ  [dt=0]
                        --> current_position = 0
t=61560 [st=  2]        HTTP2_STREAM_UPDATE_SEND_WINDOW
                        --> delta = -112
                        --> stream_id = 117
                        --> window_size = 65424
t=61560 [st=  2]     -HTTP_TRANSACTION_SEND_REQUEST
t=61560 [st=  2]     +HTTP_TRANSACTION_READ_HEADERS  [dt=270]
t=61830 [st=272]        HTTP_TRANSACTION_READ_RESPONSE_HEADERS
                        --> HTTP/1.1 302
                            status: 302
                            date: Tue, 30 Apr 2019 22:20:45 GMT
                            content-type: text/html; charset=UTF-8
                            content-length: 0
                            location: http://example.com/api/v1/track/login?time=1556662845627
                            server: Apache/2.4.25 (Debian)
                            x-powered-by: PHP/5.6.39
                            expires: Thu, 19 Nov 1981 08:52:00 GMT
                            cache-control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
                            pragma: no-cache
                            set-cookie: [74 bytes were stripped]
                            set-cookie: [77 bytes were stripped]
                            access-control-allow-origin: *
                            access-control-allow-headers: origin, x-requested-with, content-type
                            access-control-allow-methods: PUT, GET, POST, DELETE, OPTIONS
t=61830 [st=272]     -HTTP_TRANSACTION_READ_HEADERS
t=61830 [st=272]      NETWORK_DELEGATE_HEADERS_RECEIVED  [dt=0]
t=61830 [st=272]      URL_REQUEST_DELEGATE_RECEIVED_REDIRECT  [dt=2]
t=61832 [st=274]      CANCELLED
t=61832 [st=274] -REQUEST_ALIVE
以下是第三次请求中的全部数据-

t=61346 [st= 0] +REQUEST_ALIVE  [dt=97]
                 --> priority = "MEDIUM"
                 --> url = "https://test.undostres.com.mx/api/v1/track/login?time=1556662845405"
t=61346 [st= 0]    NETWORK_DELEGATE_BEFORE_URL_REQUEST  [dt=0]
t=61346 [st= 0]   +URL_REQUEST_START_JOB  [dt=97]
                   --> load_flags = 0 (NORMAL)
                   --> method = "POST"
                   --> privacy_mode = 0
                   --> upload_id = "0"
                   --> url = "https://test.undostres.com.mx/api/v1/track/login?time=1556662845405"
t=61346 [st= 0]      NETWORK_DELEGATE_BEFORE_START_TRANSACTION  [dt=0]
t=61346 [st= 0]      HTTP_CACHE_GET_BACKEND  [dt=0]
t=61346 [st= 0]     +HTTP_STREAM_REQUEST  [dt=1]
t=61346 [st= 0]        HTTP_STREAM_JOB_CONTROLLER_BOUND
                       --> source_dependency = 1619732 (HTTP_STREAM_JOB_CONTROLLER)
t=61347 [st= 1]        HTTP_STREAM_REQUEST_BOUND_TO_JOB
                       --> source_dependency = 1619733 (HTTP_STREAM_JOB)
t=61347 [st= 1]     -HTTP_STREAM_REQUEST
t=61347 [st= 1]      UPLOAD_DATA_STREAM_INIT  [dt=0]
                     --> is_chunked = false
                     --> net_error = 0 (?)
                     --> total_size = 105
t=61347 [st= 1]     +HTTP_TRANSACTION_SEND_REQUEST  [dt=1]
t=61347 [st= 1]        HTTP_TRANSACTION_HTTP2_SEND_REQUEST_HEADERS
                       --> :method: POST
                           :authority: test.undostres.com.mx
                           :scheme: https
                           :path: /api/v1/track/login?time=1556662845405
                           content-length: 105
                           accept: application/json, text/javascript, */*; q=0.01
                           origin: https://test.undostres.com.mx
                           x-requested-with: XMLHttpRequest
                           user-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.103 Safari/537.36
                           content-type: application/x-www-form-urlencoded; charset=UTF-8
                           referer: https://test.undostres.com.mx/index.php
                           accept-encoding: gzip, deflate, br
                           accept-language: en-US,en;q=0.9
                           cookie: [1345 bytes were stripped]
t=61348 [st= 2]        UPLOAD_DATA_STREAM_READ  [dt=0]
                       --> current_position = 0
t=61348 [st= 2]        HTTP2_STREAM_UPDATE_SEND_WINDOW
                       --> delta = -105
                       --> stream_id = 113
                       --> window_size = 65431
t=61348 [st= 2]     -HTTP_TRANSACTION_SEND_REQUEST
t=61348 [st= 2]     +HTTP_TRANSACTION_READ_HEADERS  [dt=95]
t=61443 [st=97]        HTTP_TRANSACTION_READ_RESPONSE_HEADERS
                       --> HTTP/1.1 200
                           status: 200
                           date: Tue, 30 Apr 2019 22:20:45 GMT
                           content-type: text/html; charset=UTF-8
                           content-length: 41
                           server: Apache/2.4.25 (Debian)
                           x-powered-by: PHP/5.6.39
                           expires: Thu, 19 Nov 1981 08:52:00 GMT
                           cache-control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
                           pragma: no-cache
                           access-control-allow-origin: *
                           access-control-allow-headers: origin, x-requested-with, content-type
                           access-control-allow-methods: PUT, GET, POST, DELETE, OPTIONS
t=61443 [st=97]     -HTTP_TRANSACTION_READ_HEADERS
t=61443 [st=97]      NETWORK_DELEGATE_HEADERS_RECEIVED  [dt=0]
t=61443 [st=97]   -URL_REQUEST_START_JOB
t=61443 [st=97]    URL_REQUEST_DELEGATE_RESPONSE_STARTED  [dt=0]
t=61443 [st=97]   +HTTP_TRANSACTION_READ_BODY  [dt=0]
t=61443 [st=97]      HTTP2_STREAM_UPDATE_RECV_WINDOW
                     --> delta = -41
                     --> stream_id = 113
                     --> window_size = 6291415
t=61443 [st=97]   -HTTP_TRANSACTION_READ_BODY
t=61443 [st=97]    URL_REQUEST_JOB_FILTERED_BYTES_READ
                   --> byte_count = 41
t=61443 [st=97]    HTTP_TRANSACTION_READ_BODY  [dt=0]
t=61443 [st=97] -REQUEST_ALIVE
在尝试修复此问题时，我们能够使用以下代码使其正常工作-

<meta http-equiv="Content-Security-Policy" content="upgrade-insecure-requests">
看起来您的web服务器正在返回指向不安全URL的重定向

HTTP_TRANSACTION_READ_RESPONSE_HEADERS
                    --> HTTP/1.1 302
                        status: 302
                        date: Tue, 30 Apr 2019 22:20:45 GMT
                        content-type: text/html; charset=UTF-8
                        content-length: 0
                        location: http://example.com/api/v1/track/login?time=1556662845627
Chrome拒绝重定向到该URL，因为它已经在HTTPS上。我猜有了meta标签，Chrome会自动将HTTP转换为HTTPS，一切正常

因此，首先要了解的是，为什么服务器在已经收到HTTPS请求的情况下向HTTP URL发送重定向。

问题是应用程序级重定向位置：。。。作为对ajax请求的响应发送。

您可以在任何其他浏览器中复制此内容吗？如果它只发生在Chrome中，你可能想考虑添加一个标签来让它更清楚。@ SsiDeWoBalk：是的，它可以在SAFARY中复制。因此，如果没有web服务器代码的源代码，很难看到第四个请求有什么不同。发送的cookies有什么不同吗？发布的数据有什么不同吗？web服务器是否限制了您的速率？它是负载平衡的，并且使用不同的web服务器吗？可能一个基本URL在一个web服务器和另一个web服务器中的配置不同？发送的Cookie是否有任何不同？无法判断，因为显示了临时标头。没有速率限制。没有不同的服务器。图片中没有不同的配置。不过谢谢你的想法。实际上我刚开始在服务器上记录请求头，发现第四个请求与其他三个请求相比有一个额外的cookiekey值。这对事情有什么影响？如何深入研究这个问题@AaronHollandit是一个应用程序级问题。谢谢你的帮助。 
HTTP_TRANSACTION_READ_RESPONSE_HEADERS
                    --> HTTP/1.1 302
                        status: 302
                        date: Tue, 30 Apr 2019 22:20:45 GMT
                        content-type: text/html; charset=UTF-8
                        content-length: 0
                        location: http://example.com/api/v1/track/login?time=1556662845627