FCloudflare Docs
Presigned URLs are an S3 concept 
for sharing direct access to your bucket without revealing your token secret. A presigned URL authorizes anyone with the URL to perform an action to the S3 compatibility endpoint for an R2 bucket. By default, the S3 endpoint requires an AUTHORIZATION header signed by your token. Every presigned URL has S3 param...
for sharing direct access to your bucket without revealing your token secret. A presigned URL authorizes anyone with the URL to perform an action to the S3 compatibility endpoint for an R2 bucket. By default, the S3 endpoint requires an AUTHORIZATION header signed by your token. Every presigned URL has S3 param...
NI created a bucket, but i don't see tab Access Keys
Nhelp me, please
N
Ncreate API token ?
N
NIs this correct, sir?
Nthank you so much, i'm done
NI got this error when I sent a link to my friend to see photos on r2
Nhow to use, thanks for helping me
ĐCould you confirm if this is bug? If I use the endpoint create by API, it will create
content-dispositioncontent-disposition
ĐThanks, but do we have other options to set filename for download link using custom domain?
ĐAlso where can I read more about this?
.Can anyone give me a working answer? Why is it stuck on cors localhost even though I set cors to use * in all cases?
try {
const response = await fetch(url);
if (!response.ok) {
throw new Error(
);
}
const blob = await response.blob();
return await new Promise((resolve, reject) => {
const reader = new FileReader();
reader.onloadend = () => resolve(reader.result);
reader.onerror = () =>
reject(new Error("Failed to read blob as data URL"));
reader.readAsDataURL(blob);
});
} catch (error) {
throw new Error(
}
}
try {
const response = await fetch(url);
if (!response.ok) {
throw new Error(
Failed to load image: ${response.status} ${response.statusText});
}
const blob = await response.blob();
return await new Promise((resolve, reject) => {
const reader = new FileReader();
reader.onloadend = () => resolve(reader.result);
reader.onerror = () =>
reject(new Error("Failed to read blob as data URL"));
reader.readAsDataURL(blob);
});
} catch (error) {
throw new Error(
Failed to load image: ${error.message}}
}
FTroubleshooting 403 / CORS issues with R2
So, your assets aren't loading because you are getting a CORS error despite having setup everything correctly?
Let's try troubleshooting.
In your browser console, do you see a 401/403 error right above the CORS error? If yes, then you aren't actually dealing with a CORS issue! If you do have a CORS issue, head to the last section.
If you are using a Custom domain
Go to the Network tab and find the failing request (you may need to reload the page, since only requests after opening the developer tools are logged).
You need to check the response headers for the following two headers:
cf-cache-statuscf-mitigated
cf-mitigatedYour request was blocked by one of your WAF rules. Go to Security Events and look for what service blocked your request.
If you don't have a cf-cache-status
header
cf-cache-statusYour request was blocked by Hotlink Protection.
Go to your dashboard and disable it or write a configuration rule to only disable on your Custom domain
If you are using the S3 API
Your request is very likely incorrectly signed.
Try executing the request via curl to inspect the real response returned by the S3 api and then tackle that issue.
Once your request is correctly signed, you'll receive the proper CORS headers.
If it's actually CORS
Here are some common issues with CORS configurations:
is missing headers likeExposeHeadersETag
is missing headers likeAllowedHeaders
orAuthorizationContent-Type
is missing methods likeAllowedMethods
/POST
(you do not need to includePUT
)OPTIONS
Bhi
I want to use the free version of R2. Do I still need to enter my bank or PayPal account information?
I want to use the free version of R2. Do I still need to enter my bank or PayPal account information?
IYes. It's required to help prevent abuse.
BThis will be problematic for those living in countries where international bank accounts are not available, especially since they only want to use the free version and Cloudflare may limit their account if their bandwidth increases.
BCan anyone recommend a free cloud storage service that doesn't demand bank details for initial signup and is actually free to use?
BThanks bro, but my problem is that I don't have access to any of these payment providers
BNo
ZCloudflare won't limit you for using r2
BI Know
BCan anyone recommend a free cloud storage service that doesn't demand bank details for initial signup and is actually free to use? Please send me in Direct message
RHello guys, do you have any idea why the cache doesn't work? I've got a bunch of small images stored in R2 and displayed on my website. I have a Cache rule set, but there are still a lot of Class B operations.
Rfrom 10kb to 1mb
RNot sure if I can filter by hostname. But this screenshot for whole website
RI just thought if I set cache to 1 year then there shouldn't be any Class B operations. Thanks anyway
Ddoes anyone know what the issue here is general-helpCloudflare R2
Di can’t fix it
FTroubleshooting 403 / CORS issues with R2
So, your assets aren't loading because you are getting a CORS error despite having setup everything correctly?
Let's try troubleshooting.
In your browser console, do you see a 401/403 error right above the CORS error? If yes, then you aren't actually dealing with a CORS issue! If you do have a CORS issue, head to the last section.
If you are using a Custom domain
Go to the Network tab and find the failing request (you may need to reload the page, since only requests after opening the developer tools are logged).
You need to check the response headers for the following two headers:
cf-cache-statuscf-mitigated
cf-mitigatedYour request was blocked by one of your WAF rules. Go to Security Events and look for what service blocked your request.
If you don't have a cf-cache-status
header
cf-cache-statusYour request was blocked by Hotlink Protection.
Go to your dashboard and disable it or write a configuration rule to only disable on your Custom domain
If you are using the S3 API
Your request is very likely incorrectly signed.
Try executing the request via curl to inspect the real response returned by the S3 api and then tackle that issue.
Once your request is correctly signed, you'll receive the proper CORS headers.
If it's actually CORS
Here are some common issues with CORS configurations:
is missing headers likeExposeHeadersETag
is missing headers likeAllowedHeaders
orAuthorizationContent-Type
is missing methods likeAllowedMethods
/POST
(you do not need to includePUT
)OPTIONS
RThanks for the explanation
Doh my god thank you
Di had a rule that was blocking cdn
RI'm using R2 to serve images uploaded by users of my app. I'm tempted to disable public access to the R2 bucket, and serve images via worker. I'm wondering if there are downsides to this? Would it significantly worsen the performance due to worker invocation? What's the general good practice when using R2-files to the public?
RMy users have accounts at subdomain.domain.com, and I’d like their images to appear to be served from their subdomains, rather than from the central assets.domain.con
RCreate a bucket per user? Hmm.. maybe. I’d have to check on limits. I don’t know yet how many users I’ll have, could be thousands.
RThanks for the info. I think I'll stick to one bucket for now.
DGood evening, I just wanted to check/ask to be sure, do file fetches in public buckets count towards Class B operations? 
(asking because I worry that if they do, someone could technically spam requests on the bucket and could perhaps cost me quite a bit of money)
(asking because I worry that if they do, someone could technically spam requests on the bucket and could perhaps cost me quite a bit of money)
DHmm ok, thank you :firefly: !
Not sure where I can even set up rate limiting but I'll have a look.
I'm just trying to prevent that I wake up to a multi hundred/thousand dollar bill at some point
But it seems like with caching (which should be enabled) and rate limiting perhaps it should be fine (its a bucket with a bunch of relatively small images (KB's), and while class B operations are generally a whole lot cheaper, I do want to be cautious)
Not sure where I can even set up rate limiting but I'll have a look.
I'm just trying to prevent that I wake up to a multi hundred/thousand dollar bill at some point
But it seems like with caching (which should be enabled) and rate limiting perhaps it should be fine (its a bucket with a bunch of relatively small images (KB's), and while class B operations are generally a whole lot cheaper, I do want to be cautious)
Doh I have, set them up at like 80 % of the free tier for now to see how long it takes until I hit it
I just wish there was some option to like disable the DNS domain after a certain threshhold is met (like idk, disable the bucket's DNS record after 25 million class B operations for example)
I just wish there was some option to like disable the DNS domain after a certain threshhold is met (like idk, disable the bucket's DNS record after 25 million class B operations for example)
Dperhaps it'd be possible with the cloudflare API? maybe I should check out if that's a possibility
Dwhere can you select a webhook for that? all I can see is a notification email
Dah there's a Destinations tab
DHmm, when checking the wiki it says it needs a professional or higher plan but I can make them anyway
Dyeah but I don't mind having to create a smal script/program for that tbh
