how to get uncached data from webread

Question

Kamal 2024-5-2

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2114096-how-to-get-uncached-data-from-webread

回答： Chetan 2024-5-2

I am using the webread to get the data from the following api:

us-central1-techspardha-87928.cloudfunctions.net/api2/events/description?eventCategory=Programming&eventName=Productathon

The data has been updated via the backend and it seems like i am getting a stale data

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Answer 1

Chetan 2024-5-2

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https://ww2.mathworks.cn/matlabcentral/answers/2114096-how-to-get-uncached-data-from-webread#answer_1451141

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Hi @Ketan,

I understand that you're using MATLAB's `webread` function to fetch updated data from an API but are receiving stale data despite backend updates.

As a workaround you can try the following steps:

1. Cache Issue: Append a unique query parameter to bypass potential caching, using the current timestamp as a cache buster.

cacheBuster = posixtime(datetime('now'));
url = sprintf('https://us-central1-techspardha-87928.cloudfunctions.net/api2/events/description?eventCategory=Programming&eventName=Productathon&cb=%d', cacheBuster);
data = webread(url)
data = struct with fields:
       data: [1x1 struct]
    success: 1

2. Headers Adjustment: Use `weboptions` to set `Cache-Control: no-cache` in the request header.

options = weboptions('HeaderFields', {'Cache-Control','no-cache'});
url = 'https://us-central1-techspardha-87928.cloudfunctions.net/api2/events/description?eventCategory=Programming&eventName=Productathon';
data = webread(url, options)
data = struct with fields:
       data: [1x1 struct]
    success: 1