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<p class="MsoNormal"><span style="font-size:12.0pt">hi, <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"> Etag is to check whether the json string returned by the server has changed , I plan to use MD5 encryption to generate etag , can’t find etag in http request header.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"> Here are the steps I tested:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"> 1, I used postman to send the first request to a URL, and added the etag property to the header of the response use hard code , then http connection function async_write respond header buffer
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"> 2, Request the same url, read the header of the request, no etag can be found.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"> Here are some logs:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Respond:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: (2021-01-11 23:45:25) [DEBUG "http_connection.hpp":683] 0x1a3e4c8 doWrite<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: zs_debug res result : 200<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: field : Strict-Transport-Security , /text: Strict-Transport-Security ,Value: max-age=315<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">36000; includeSubdomains; preload<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: field : X-Frame-Options , /text: X-Frame-Options ,Value: DENY<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: field : Pragma , /text: Pragma ,Value: no-cache<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: field : Cache-Control , /text: Cache-Control ,Value: no-Store,no-Cache<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: field : <unknown-field> , /text: X-XSS-Protection ,Value: 1; mode=block<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: field : <unknown-field> , /text: X-Content-Type-Options ,Value: nosniff<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: field : <unknown-field> , /text: Content-Security-Policy ,Value: default-src 'none'; img<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">-src 'self' data:; font-src 'self'; style-src 'self'; script-src 'self'; connect-src 'self' wss:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: field : Content-Type , /text: Content-Type ,Value: application/json<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: field : ETag , /text: ETag ,Value: ba2e34ec8c7d9168cc2bf880a1674ae4<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: field : Content-Length , /text: Content-Length ,Value: 525<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: zs_debug response: {<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: "@odata.id": "/redfish/v1/CertificateService/CertificateLocations",<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: "@odata.type": "#CertificateLocations.v1_0_0.CertificateLocations",<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: "Description": "Defines a resource that an administrator can use in order to locate all<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">certificates installed on a given service",<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: "Id": "CertificateLocations",<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: "Links": {<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: "Certificates": [<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: {<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: "@odata.id": "/redfish/v1/Managers/bmc/NetworkProtocol/HTTPS/Certificates/1"<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: }<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: ],<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]:
<a href="mailto:Certificates@odata.count">Certificates@odata.count</a>: 1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: },<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: "Name": "Certificate Locations"<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: }<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: (2021-01-11 23:45:25) [DEBUG "http_connection.hpp":698] 0x1a3e4c8 async_write 997 bytes<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Second Request: <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: (2021-01-11 23:45:25) [DEBUG "http_connection.hpp":511] 0x1a3e4c8 doReadHeaders<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: zs_debug read http_head :GET /redfish/v1/CertificateService/CertificateLocations HTTP/1.1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: Authorization: Basic cm9vdDowcGVuQm1j<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: User-Agent: PostmanRuntime/7.28.4<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: Accept: */*<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: Cache-Control: no-cache<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: Postman-Token: 1981d43c-7067-4959-a853-dd7f93bb04fa<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: Host: 10.239.138.19<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: Accept-Encoding: gzip, deflate, br<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]: Connection: keep-alive<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Jan 11 23:45:25 intel-obmc bmcweb[361]:<o:p></o:p></span></p>
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