Enable Ktor HttpCaching

[opatry]

When testing with 2 consecutive calls to https://httpbin.org/cache, I get 200 OK and 304 NOT MODIFIED as expected. That being said, when using Google Tasks API, I only get 200… maybe server doesn't provide Http Caching?

With httpbin requests:

REQUEST: https://httpbin.org/cache
METHOD: GET
COMMON HEADERS
-> Accept: application/json
-> Accept-Charset: UTF-8
-> Accept-Encoding: gzip
-> Authorization: Bearer xxxx
-> User-Agent: curl/7.61.0
CONTENT HEADERS
-> Content-Length: 0
RESPONSE: 200 OK
METHOD: GET
FROM: https://httpbin.org/cache
COMMON HEADERS
-> Access-Control-Allow-Credentials: true
-> Access-Control-Allow-Origin: *
-> Connection: keep-alive
-> Content-Length: 591
-> Content-Type: application/json
-> Date: Thu, 08 May 2025 18:58:23 GMT
-> ETag: 4e488dc9a19e48f884cfca5e77607599
-> Last-Modified: Thu, 08 May 2025 18:58:23 GMT
-> Server: gunicorn/19.9.0
=======================================================================================
REQUEST: https://httpbin.org/cache
METHOD: GET
COMMON HEADERS
-> Accept: application/json
-> Accept-Charset: UTF-8
-> Accept-Encoding: gzip
-> Authorization: Bearer xxxx
-> If-Modified-Since: Thu, 08 May 2025 18:58:23 GMT
-> If-None-Match: 4e488dc9a19e48f884cfca5e77607599
-> User-Agent: curl/7.61.0
CONTENT HEADERS
-> Content-Length: 0
RESPONSE: 304 NOT MODIFIED
METHOD: GET
FROM: https://httpbin.org/cache
COMMON HEADERS
-> Access-Control-Allow-Credentials: true
-> Access-Control-Allow-Origin: *
-> Connection: keep-alive
-> Date: Thu, 08 May 2025 18:58:26 GMT
-> Server: gunicorn/19.9.0

With Google Tasks requests:

REQUEST: https://tasks.googleapis.com/tasks/v1/users/@me/lists
METHOD: GET
COMMON HEADERS
-> Accept: application/json
-> Accept-Charset: UTF-8
-> Accept-Encoding: gzip
-> Authorization: Bearer xxxx
-> User-Agent: curl/7.61.0
CONTENT HEADERS
-> Content-Length: 0
RESPONSE: 200 OK
METHOD: GET
FROM: https://tasks.googleapis.com/tasks/v1/users/@me/lists
COMMON HEADERS
-> Alt-Svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000
-> Content-Type: application/json; charset=UTF-8
-> Date: Thu, 08 May 2025 18:55:57 GMT
-> ETag: "jN-nxpZbjK0"
-> Server: ESF
-> Transfer-Encoding: chunked
-> Vary: Origin; X-Origin; Referer
-> X-Content-Type-Options: nosniff
-> X-Frame-Options: SAMEORIGIN
-> X-XSS-Protection: 0
-> x-l2-request-path: l2-managed-14
=======================================================================================
REQUEST: https://tasks.googleapis.com/tasks/v1/users/@me/lists
METHOD: GET
COMMON HEADERS
-> Accept: application/json
-> Accept-Charset: UTF-8
-> Accept-Encoding: gzip
-> Authorization: Bearer xxxx
-> If-None-Match: "jN-nxpZbjK0"
-> User-Agent: curl/7.61.0
CONTENT HEADERS
-> Content-Length: 0
RESPONSE: 200 OK
METHOD: GET
FROM: https://tasks.googleapis.com/tasks/v1/users/@me/lists
COMMON HEADERS
-> Alt-Svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000
-> Content-Type: application/json; charset=UTF-8
-> Date: Thu, 08 May 2025 18:55:58 GMT
-> ETag: "jN-nxpZbjK0"
-> Server: ESF
-> Transfer-Encoding: chunked
-> Vary: Origin; X-Origin; Referer
-> X-Content-Type-Options: nosniff
-> X-Frame-Options: SAMEORIGIN
-> X-XSS-Protection: 0
-> x-l2-request-path: l2-managed-14

Checklist

• I have read the CONTRIBUTING guide
• Code compiles correctly
• Created tests which fail without the change (if possible)
• All tests passing

[opatry]

It appears, I finally got some 304 responses 🎉
Might depends on endpoints.

Typically, listing of tasks seems to allow caching 👍

[2025-05-08T19:05:14.468357Z][info] REQUEST: https://tasks.googleapis.com/tasks/v1/users/@me/lists?maxResults=100
METHOD: GET
[2025-05-08T19:05:14.748332Z][info] RESPONSE: 200 OK
METHOD: GET
FROM: https://tasks.googleapis.com/tasks/v1/users/@me/lists?maxResults=100
[2025-05-08T19:05:14.757835Z][info] REQUEST: https://tasks.googleapis.com/tasks/v1/lists/MTAwNDEyMDI1NDY0NDEwNzQ0NDI6MDow/tasks?maxResults=100&showCompleted=true&showDeleted=false&showHidden=true&showAssigned=false
METHOD: GET
[2025-05-08T19:05:15.021078Z][info] RESPONSE: 304 Not Modified
METHOD: GET
FROM: https://tasks.googleapis.com/tasks/v1/lists/MTAwNDEyMDI1NDY0NDEwNzQ0NDI6MDow/tasks?maxResults=100&showCompleted=true&showDeleted=false&showHidden=true&showAssigned=false
[2025-05-08T19:05:15.045179Z][info] REQUEST: https://tasks.googleapis.com/tasks/v1/lists/OXl0d1JibXgyeW1zWWFIMw/tasks?maxResults=100&showCompleted=true&showDeleted=false&showHidden=true&showAssigned=false
METHOD: GET
[2025-05-08T19:05:15.403740Z][info] RESPONSE: 304 Not Modified
METHOD: GET
FROM: https://tasks.googleapis.com/tasks/v1/lists/OXl0d1JibXgyeW1zWWFIMw/tasks?maxResults=100&showCompleted=true&showDeleted=false&showHidden=true&showAssigned=false
[2025-05-08T19:05:15.423419Z][info] REQUEST: https://tasks.googleapis.com/tasks/v1/lists/UFd4NktUODJJbjNCX3J0aQ/tasks?maxResults=100&showCompleted=true&showDeleted=false&showHidden=true&showAssigned=false
METHOD: GET
[2025-05-08T19:05:15.711710Z][info] RESPONSE: 304 Not Modified
METHOD: GET
FROM: https://tasks.googleapis.com/tasks/v1/lists/UFd4NktUODJJbjNCX3J0aQ/tasks?maxResults=100&showCompleted=true&showDeleted=false&showHidden=true&showAssigned=false
[2025-05-08T19:05:15.723765Z][info] REQUEST: https://tasks.googleapis.com/tasks/v1/lists/MEg4NVpsZXlDelZDbnV4Xw/tasks?maxResults=100&showCompleted=true&showDeleted=false&showHidden=true&showAssigned=false
METHOD: GET
[2025-05-08T19:05:16.017678Z][info] RESPONSE: 304 Not Modified
METHOD: GET
FROM: https://tasks.googleapis.com/tasks/v1/lists/MEg4NVpsZXlDelZDbnV4Xw/tasks?maxResults=100&showCompleted=true&showDeleted=false&showHidden=true&showAssigned=false
[2025-05-08T19:05:16.021149Z][info] REQUEST: https://tasks.googleapis.com/tasks/v1/lists/YVpoQ29QaTFtLWE4bVRPSg/tasks?maxResults=100&showCompleted=true&showDeleted=false&showHidden=true&showAssigned=false
METHOD: GET
[2025-05-08T19:05:16.282570Z][info] RESPONSE: 304 Not Modified
METHOD: GET
FROM: https://tasks.googleapis.com/tasks/v1/lists/YVpoQ29QaTFtLWE4bVRPSg/tasks?maxResults=100&showCompleted=true&showDeleted=false&showHidden=true&showAssigned=false
[2025-05-08T19:05:16.288025Z][info] REQUEST: https://tasks.googleapis.com/tasks/v1/lists/NE1oSEp5MmpmbXl3Sm1iZA/tasks?maxResults=100&showCompleted=true&showDeleted=false&showHidden=true&showAssigned=false
METHOD: GET
[2025-05-08T19:05:16.575660Z][info] RESPONSE: 304 Not Modified
METHOD: GET
FROM: https://tasks.googleapis.com/tasks/v1/lists/NE1oSEp5MmpmbXl3Sm1iZA/tasks?maxResults=100&showCompleted=true&showDeleted=false&showHidden=true&showAssigned=false
[2025-05-08T19:05:16.585245Z][info] REQUEST: https://tasks.googleapis.com/tasks/v1/lists/NjdVc0lJSEJ0Znc3S1pPNQ/tasks?maxResults=100&showCompleted=true&showDeleted=false&showHidden=true&showAssigned=false
METHOD: GET
[2025-05-08T19:05:16.856464Z][info] RESPONSE: 304 Not Modified
METHOD: GET
FROM: https://tasks.googleapis.com/tasks/v1/lists/NjdVc0lJSEJ0Znc3S1pPNQ/tasks?maxResults=100&showCompleted=true&showDeleted=false&showHidden=true&showAssigned=false