deflate | Automatically exported from code.google.com/p/deflate
kandi X-RAY | deflate Summary
kandi X-RAY | deflate Summary
This project provides two simple programs:. They are implented using the System.IO.Compression.DeflateStream provided in .NET.
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QUESTION
Good Day!
I would like ask for your help on decompressing String back to its original data.
Here's the document that was sent to me by the provider.
Data description
First part describes the threshold data.
All data are managed as Little Endian IEEE 754 single precision floating numbers. Their binary representation are (represented in hexadecimal data) :
Compressed data (zip) Threshold binary data are compressed using the ‘deflate’ algorithm. Each compression result is given here (represented in hexadecimal data) :
Thresholds: $63 00 03 05 47 24 DA 81 81 A1 C1 9E 81 61 01 98 06 00
Encoded data (base64) Threshold compressed data are encoded in ‘base64’ to be transmitted as ASCII characters. Each conversion results is given here (represented in hexadecimal data) :
Thresholds: $59 77 41 44 42 55 63 6B 32 6F 47 42 6F 63 47 65 67 57 45 42 6D 41 59 41
Here is the output frame (Manufacturer frame content) The thresholds data are then sent using their corresponding ASCII character Here is the resulting Histogram ASTM frame sent :
YwADBUck2oGBocGegWEBmAYA
As explained in above details, what I want to do is backwards.
The packets that we received is
YwADBUck2oGBocGegWEBmAYA
then from there convert it to Hex value Base64 which is the output is.
Thresholds: $59 77 41 44 42 55 63 6B 32 6F 47 42 6F 63 47 65 67 57 45 42 6D 41 59 41
This first part was already been implemented using this line of codes.
...ANSWER
Answered 2022-Mar-23 at 16:03Your input string is a base64 encoded array of bytes, representing a compressed (deflated) sequence of floating point values (float
/ Single
).
- You can use Convert.FromBase64String() to get the compressed bytes
- Initialize a MemoryStream with this byte array. It's used as the input stream of a DeflateStream
- Initialize a new MemoryStream to receive the deflated content from the DeflateStream.CopyTo() method
- Get a series of 4 bytes from the decompressed array of bytes and reconstruct the original values (here, using BitConverter.ToSingle() and an ArraySegment(Of Byte)).
An example:
QUESTION
consider a flask app:
...ANSWER
Answered 2022-Mar-25 at 03:28Edit: I've rewritten my answer because I hadn't considered the format of the request (raw).
I found two options. Option 1 entails parsing the http request (using http-request-translator) before passing it to the flask test client. Option 2 does the same thing in a much cleaner way making use of low-level Werkzeug modules. Unfortunately, Option 2 doesn't work because of unmaintained code. I've included it anyway, in case someone can maintain/fork the project werkzeug-raw.
app.py:
QUESTION
I want to download/scrape 50 million log records from a site. Instead of downloading 50 million in one go, I was trying to download it in parts like 10 million at a time using the following code but it's only handling 20,000 at a time (more than that throws an error) so it becomes time-consuming to download that much data. Currently, it takes 3-4 mins to download 20,000 records with the speed of 100%|██████████| 20000/20000 [03:48<00:00, 87.41it/s]
so how to speed it up?
ANSWER
Answered 2022-Feb-27 at 14:37If it's not the bandwidth that limits you (but I cannot check this), there is a solution less complicated than the celery and rabbitmq but it is not as scalable as the celery and rabbitmq, it will be limited by your number of CPU.
Instead of splitting calls on celery workers, you split them on multiple processes.
I modified the fetch
function like this:
QUESTION
I have some react code that is rendering content dynamically via React.createElement
. As such, css is applied via an object. Elements in that dynamic generation can have background image, pointing to a public aws S3 bucket.
It seems that every time my components re-render, the background images are being fetched again from S3. This is delaying the page render. I have S3 meta-data for Cache-Control set on all the objects . Here are request and response headers for background image load -
Response header -
...ANSWER
Answered 2022-Feb-23 at 20:53The reason you're seeing a network request is probably because you're using the Cache-Control: no-cache
header in your request.
As seen here:
The no-cache response directive indicates that the response can be stored in caches, but the response must be validated with the origin server before each reuse, even when the cache is disconnected from the origin server.
Cache-Control: no-cache
If you want caches to always check for content updates while reusing stored content, no-cache is the directive to use. It does this by requiring caches to revalidate each request with the origin server.
Note that no-cache does not mean "don't cache". no-cache allows caches to store a response but requires them to revalidate it before reuse. If the sense of "don't cache" that you want is actually "don't store", then no-store is the directive to use.
See here: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control#response_directives
Here is what a full request for a cached asset looks like on my network tab, when the asset returns 304 Not Modified from the validation request. (from S3) This is in a background: url
context.
QUESTION
Can anyone help me to remove query string from URL using .htaccess
Current URL
...ANSWER
Answered 2022-Feb-10 at 13:05With your shown samples, attempts please try following htaccess rules. Please make sure to place these rules at the top of your htaccess file.
Also make sure to clear your browser cache before testing your URLs.
QUESTION
updated:
To reproduce the issue is very simple with a few steps:
- Install it on your Ubuntu server by running the following command:
/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/posthog/posthog/HEAD/bin/deploy-hobby)"
During the auto installation process, you will be prompted to enter the domain for your Posthog site, so enter one and wait for the process to finish.
Visit the domain you entered and it is accessbile.
Now reboot your VPS and visit the domain again it is down forever. Not accessbile even if you use your vps ip address.
I've tried this auto-installation and reboot thing three times on the same vps and ended up with the same result. I've also tried it on another vps by a new hosting provider, yet still the same issue. Fresh installation and the site will be down right after your reboot your vps!
The following is the error log I got from the Caddy container, which is generated after the vps reboot:
{"level":"error","ts":1642534398.9394724,"logger":"http.log.error","msg":"dial tcp 172.18.0.4:8000: connect: connection refused","request":{"remote_addr":"67.198.228.123:35424","proto":"HTTP/2.0","method":"GET","host":"","uri":"/preflight","headers":{"Sec-Ch-Ua":["" Not A;Brand";v="99", "Chromium";v="96", "Google Chrome";v="96""],"User-Agent":["Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.110 Safari/537.36"],"Sec-Fetch-Site":["cross-site"],"Accept-Language":["en-US,en;q=0.9"],"Accept-Encoding":["gzip, deflate, br"],"Cookie":["phtoolbar=yes; csrftoken=gsVfpdF56rbYgQQdwywH45zi83i386oe5KZZef3mIE00bumaQCG3i4OM35bdJIxQ; ph_sTMFPsFhdP1Ssg_posthog=%7B%22distinct_id%22%3A%22FpLgrw74q9qcclLSJ1bOrzsiPJmZtHdKswxemTFy9LG%22%7D"],"Cache-Control":["max-age=0"],"Sec-Ch-Ua-Mobile":["?0"],"Upgrade-Insecure-Requests":["1"],"Sec-Fetch-Dest":["document"],"Sec-Ch-Ua-Platform":[""macOS""],"Accept":["text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,/;q=0.8,application/signed-exchange;v=b3;q=0.9"],"Sec-Fetch-Mode":["navigate"],"Sec-Fetch-User":["?1"]},"tls":{"resumed":false,"version":772,"cipher_suite":4865,"proto":"h2","proto_mutual":true,"server_name":""}},"duration":0.008754516,"status":502,"err_id":"gicbjv2m4","err_trace":"reverseproxy.statusError (reverseproxy.go:886)"} {"level":"error","ts":1642534401.5881941,"logger":"http.log.error","msg":"dial tcp 172.18.0.4:8000: connect: connection refused","request":{"remote_addr":"67.198.228.123:35424","proto":"HTTP/2.0","method":"GET","host":"","uri":"/preflight","headers":{"Cache-Control":["max-age=0"],"Sec-Ch-Ua-Mobile":["?0"],"Sec-Ch-Ua-Platform":[""macOS""],"Sec-Fetch-User":["?1"],"User-Agent":["Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.110 Safari/537.36"],"Sec-Ch-Ua":["" Not A;Brand";v="99", "Chromium";v="96", "Google Chrome";v="96""],"Sec-Fetch-Mode":["navigate"],"Accept-Encoding":["gzip, deflate, br"],"Upgrade-Insecure-Requests":["1"],"Accept":["text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,/;q=0.8,application/signed-exchange;v=b3;q=0.9"],"Sec-Fetch-Site":["cross-site"],"Sec-Fetch-Dest":["document"],"Accept-Language":["en-US,en;q=0.9"],"Cookie":["phtoolbar=yes; csrftoken=gsVfpdF56rbYgQQdwywH45zi83i386oe5KZZef3mIE00bumaQCG3i4OM35bdJIxQ; ph_sTMFPsFhdP1Ssg_posthog=%7B%22distinct_id%22%3A%22FpLgrw74q9qcclLSJ1bOrzsiPJmZtHdKswxemTFy9LG%22%7D"]},"tls":{"resumed":false,"version":772,"cipher_suite":4865,"proto":"h2","proto_mutual":true,"server_name":""}},"duration":0.001907749,"status":502,"err_id":"27e15xwsj","err_trace":"reverseproxy.statusError (reverseproxy.go:886)"}
By the way, this is their documentaion page FYI: https://posthog.com/docs/self-host/deploy/hobby
Original question:
I've installed Posthog with their so-called hobby installation script on my vps and at first it was working fine. But right after I rebooted ubuntu and visited my self-hosted posthog site again, it would not load and just showed a blank page. It seems that something went wrong after I rebooted my vps. I've checked all the services required by Posthog with the command docker ps, and everything is up and running(check the screenshot attached).
I've been trying to figure it out for 4 days yet with no luck. I am new to docker and kubernetes so I do not know what causes the problem and what I should do. Please shed some light on this and help me :(
...ANSWER
Answered 2022-Feb-07 at 09:08First things first, this is a docker-compose stack, not Kubernetes.
If you take a look at the script you execute, you can see that it's downlowading docker compose and then uses it to start up your stack.
As such, executing docker-compose stop && docker-compose start
after your rebooted should fix this.
The "problem" here is the docker compose yaml that is used for the hobby project, which includes the following:
QUESTION
I fail to enable the CORS for testing with the latest NestJS 8.0.6 and a fresh http + ws project. That said, I want to see the Access-Control-Allow-Origin
in the servers response (so that the client would accept it). Here is my main.ts where I've tried 3 approches: 1) with options, 2) with a method, 3) with app.use. None of them works.
ANSWER
Answered 2021-Sep-20 at 20:29The enableCors
and { cors: true }
options are for the HTTP server (express or fastify). The URL given showing the CORS error came from a socket.io connection. To enable CORS for socket.io
you need to use the options in the @WebsocketGateway()
decorator, like
QUESTION
Here is the code from the real project, adopted for the question, so some data is hardcoded:
...ANSWER
Answered 2022-Jan-25 at 08:42There was a breaking change to the way DeflateStream operates in .NET 6. You can read more about it and the recommended actions in this Microsoft documentation.
Basically, you need to wrap the .Read
operation and check the length read versus the expected length because the operation may now return before reading the full length. Your code might look like this (based on the example in the documentation):
QUESTION
I use a HttpClient
to communicate with my server as shown below:
ANSWER
Answered 2021-Dec-23 at 15:06This is a long-standing issue #6351 in Xamarin.Android, caused by LetsEncrypt's root expiring and them moving to a new root.
Below is a copy of my post in that issue explaining the situation and the workarounds. See other posts in that thread for details on the workarounds.
Scott Helme has a fantastic write-up of the situation. Go and read that first, then I'll describe how (I think) this applies to xamarin-android.
I'm going to copy the key diagram from that article (source):
The red chain is what used to happen: the IdenTrust DST Root CA X3 is an old root certificate which is trusted pretty much everywhere, including on Android devices from 2.3.6 onwards. This is what LetsEncrypt used to use as their root, and it meant that everyone trusted them. However, this IdenTrust DST Root CA X3 recently expired, which means that a bunch of devices won't trust anything signed by it. LetsEncrypt needed to move to their own root certificate.
The blue chain is the ideal new one -- the ISRG Root X1 is LetsEncrypt's own root certificate, which is included on Android 7.1.1+. Android devices >= 7.1.1 will trust certificates which have been signed by this ISRG Root X1.
However, the problem is that old pre-7.1.1 Android devices don't know about ISRG Root X1, and don't trust this.
The workaround which LetsEncrypt is using is that old Android devices don't check whether the root certificate has expired. They therefore by default serve a chain which includes LetsEncrypt's root ISRG Root X1 certificate (which up-to-date devices trust), but also include a signature from that now-expired IdenTrust DST Root CA X3. This means that old Android devices trust the chain (as they trust the IdenTrust DST Root CA X3, and don't check whether it's expired), and newer devices also trust the chain (as they're able to work out that even though the root of the chain has expired, they still trust that middle ISRG Root X1 certificate as a valid root in its own right, and therefore trust it).
This is the green path, the one which LetsEncrypt currently serves by default.
However, the BoringSSL library used by xamarin-android isn't Android's SSL library. It 1) Doesn't trust the IdenTrust DST Root CA X3 because it's expired, and 2) Isn't smart enough to figure out that it does trust the ISRG Root X1 which is also in the chain. So if you serve the green chain in the image above, it doesn't trust it. Gack.
The options therefore are:
- Don't use BoringSSL and do use Android's SSL library. This means that xamarin-android behaves the same as other Android apps, and trusts the expired root. This is done by using
AndroidClientHandler
as described previously. This should fix Android >= 2.3.6. - Do use BoringSSL but remove the expired IdenTrust DST Root CA X3 from Android's trust store ("Digital Signature Trust Co. - DST Root CA X3" in the settings). This tricks BoringSSL into stopping its chain at the ISRG Root X1, which it trusts (on Android 7.1.1+). However this will only work on Android devices which trust the ISRG Root X1, which is 7.1.1+.
- Do use BoringSSL, and change your server to serve a chain which roots in the ISRG Root X1, rather than the expired IdenTrust DST Root CA X3 (the blue chain in the image above), using
--preferred-chain "ISRG Root X1"
. This means that BoringSSL ignores the IdenTrust DST Root CA X3 entirely, and roots to the ISRG Root X1. This again will only work on Android devices which trust the ISRG Root X1, i.e. 7.1.1+. - Do the same as 3, but by manually editing fullchain.pem.
- Use another CA such as ZeroSSL, which uses a root which is trusted back to Android 2.2, and which won't expire until 2038.
QUESTION
I have an issue that I can't wrap my head around. I have an API service built using FastAPI, and when I try to call any endpoint from another Python script on my local machine, the response takes 2+ seconds. When I send the same request through cURL or the built-in Swagger docs, the response is nearly instant.
The entire server script is this:
...ANSWER
Answered 2021-Nov-27 at 22:15Try using „127.0.0.1“ instead of „localhost“ to refer to your machine. I once had a similar issue, where the DNS lookup for localhost on windows was taking half a second or longer. I don‘t have an explanation for that behaviour, but at least one other person on SO seems to have struggled with it as well…
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