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HTTP Header Analysis

HTTP Header information is a part of HTTP protocol that a user's browser sends to called GitHub.com containing the details of what the browser wants and will accept back from the web server.

DNS

HtmlToText

productive rage dan's techie ramblings 4 april 2018 writing f# to implement 'the single layer perceptron' tl;dr this picks up from my last post learning f# via some machine learning: the single layer perceptron where i described a simple neural network ("the single layer perceptron") and took a c# implementation (from an article on the site robosoup ) and rewrote it into a style of "functional c#" with the intention of then translating it into f#. trying to do that all in one post would have made for a very very long read and so part two, here, picks things up from that point. i'm still an f# beginner and so i'm hoping that having the pain so fresh in my mind of trying to pick it up as a new language will make it easier for me to help others get started. i'm going to assume zero knowledge from the reader. (i'm also going to try to dive straight right into things, rather than covering loads of theory first - i think that there are a lot of good resources out there that introduce you to f# and functional concepts at a more abstract level but i'm going to take the approach that we want to tackle something specific and we'll discuss new f# concepts only when we encounter them while trying to get this work done!) translating the code into f# visual studio 2017 includes support for f# without having to install anything extra. to get started, create a new project of type visual f# / console application. this will generate a program.fs file that will let you build and run (it won't be anything very interesting if you run it but that doesn't matter because we're going rewrite the file from scratch!). in the c# code from last time, the core logic was contained within a static method called "go" within a static class. to set up the scaffolding for something similar in f# we'll use the following code: open system; let private go (r: random) = "todo: implement this" [<entrypoint>] let private main _ = go (new random(0)) |> ignore 0 in f#, functions are declared by the keyword "let" optionally followed by an accessibility modifier (eg. "private") followed by their name followed by their arguments followed by "=" followed by the function body. the last line of the function body will be a value that is returned by the function (unlike c#, there is no need for an explicit "return" keyword). above, there is a function "go" that takes a random argument named "r" and that returns a string. the return type is not explicitly declared anywhere but f# relies upon type inference a lot of the time to make reduce the "syntactic noise" around declaring types where the compiler can work them out on its own. if you wanted reassurance that the type inference has worked as you expect then you can hover over the word "go" and you'll see the following signature for the function - val private go : r:random -> string this confirms that the function "go" takes an argument named "r" of type random and that it returns a string . if we changed the "go" function to this: let private go r = "todo: implement this" .. and then hovered over the word "go" then we'd see the following signature: val private go : r:'a -> string this essentially means that the type "r" is not fixed and that it may be any type because there is no way for the compiler to apply any restrictions to it based upon the code that it has access to. when comparing to c#, you might imagine that this would be equivalent to this: private string go(object r) .. but it would actually be more accurate to think about it like a generic method - eg. private string go<t>(t r) the difference isn't important right now it's worth bearing in mind. there's also a function "main" that takes a single string argument argument named "_" and that returns an int. just looking at this code, you may imagine that "_" would also be of an unknown / generic type but if you hover to the word "main" then you'll see this signature: val private main : string [] -> int f# has applied some extra logic here, based upon the fact that the function has been annotated with [<entrypoint>] - this requires that the function matches the particular signature of string-array-to-string and you will get a compile error if you try to declare a function signature that differs from this. the string array is a list of arguments passed to the compiled executable if called from the command line. this will never be of use in this program and so i've named that argument "_" to tell f# that i will never want to access it. i do this because f# will warn you if you have any unused arguments because it suggests that you have forgotten something (why specify an argument if you don't need it??). if you really don't care about one, though (as is the case here), if you give it an underscore prefix (or call it simply "_") then the compiler won't warn you about it. in a similar vein, f# will warn you if you call a function and ignore its return value. if the idea is that all functions be pure (and so have no side effects) then a function is useless if you ignore its return value. in the scaffolding above, though, we just want to call "go" (which will do some calculations and write a summary to the console) - we don't really care about its return value. to tell the compiler this, we use a special function called "ignore" that we pass the return value of the "go" function to. the c# way to do this might look something like this: ignore(go(new random(0))) this is valid f# but it's criticised as having to be read "inside out". it's more common in f# to see it like this: go (new random(0)) |> ignore the "pipe forward" operator (|>) effectively means take the value on the left and use it as the last argument in the function on the right. since "ignore" only takes one argument, the two versions above are equivalent. if a function has more than one argument then the pipe operator only provides the last one. to illustrate this, consider the method "list.map" that takes two arguments; a "mapping" delegate and a list of items. it's very similar to linq's "select" method. you could call it like this: let numbers = [1;2;3] let squares = list.map (fun x -> x * x) numbers i'll breeze through some of the syntax above in a moment but the important point here is that there is a method that takes two arguments where the second is a list. it could be argued that this syntax is back-to-front because you may describe this in english as: given a list of values, perform an operation on each item (and return a new list containing the transformed - or "mapped" - values) .. but the code puts things in the opposite order ("list of values" is mentioned last instead of first). however, the pipe operator changes that - let numbers = [1;2;3] let squares = numbers |> list.map (fun x -> x * x) the code now is able to say "here is the list, perform this operation on each value to provide me with a new list". because the pipe operator passes the value on the left as the last argument to the function on the right, f# often has list-based functions where the list is the last argument. this is often the opposite order to c# functions, where the "subject" of the operation is the commonly first argument. now, as promised, a quick rundown of f# syntax introduced above. the "let" keyword is very similar to c#'s "var" in that it use type inference to determine what type the specific reference should be. unlike "var", though, you can't change the reference later on - eg. let numbers = [1;2;3] // invalid! this "=" operator is treated as a comparison whose return value is ignored // rather than this statement being a reassignment - the "numbers" reference is still // a list with the values 1, 2 and 3 (a compiler warning will be displayed) numbers = [1;2;3;4] because f# only allows you to set value in statements that include the "let" operator, it makes it easier for the f# compiler to know whether the code fragment: a = b is an assignment or a comparison - if it follows a "let" then it's

URL analysis for productiverage.com

https://www.productiverage.com///archive/2/2012
https://www.productiverage.com//mailto:[email protected]
https://www.productiverage.com///archive/2/2016
https://www.productiverage.com///archive/2/2017
https://www.productiverage.com///archive/2/2014
https://www.productiverage.com///translating-vbscript-into-c-sharp
https://www.productiverage.com///trying-to-set-a-readonly-autoproperty-value-externally-plus-a-little-benchmarkdotnet
https://www.productiverage.com///archive/1/2014
https://www.productiverage.com///archive/9/2012
https://www.productiverage.com///archive/1/2013
https://www.productiverage.com///archive/4/2015
https://www.productiverage.com///archive/all
https://www.productiverage.com///performance-tuning-a-bridgenet-react-app
https://www.productiverage.com///archive/12/2013
https://www.productiverage.com///entity-framework-projections-to-immutable-types-ienumerable-vs-iqueryable

Whois Information

Whois is a protocol that is access to registering information. You can reach when the website was registered, when it will be expire, what is contact details of the site with the following informations. In a nutshell, it includes these informations;

Domain Name: PRODUCTIVERAGE.COM
Registry Domain ID: 1646286165_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.godaddy.com
Registrar URL: http://www.godaddy.com
Updated Date: 2016-06-30T18:38:23Z
Creation Date: 2011-03-19T14:06:39Z
Registry Expiry Date: 2019-03-19T14:06:39Z
Registrar: GoDaddy.com, LLC
Registrar IANA ID: 146
Registrar Abuse Contact Email: [email protected]
Registrar Abuse Contact Phone: 480-624-2505
Domain Status: clientDeleteProhibited https://icann.org/epp#clientDeleteProhibited
Domain Status: clientRenewProhibited https://icann.org/epp#clientRenewProhibited
Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Domain Status: clientUpdateProhibited https://icann.org/epp#clientUpdateProhibited
Name Server: NS47.DOMAINCONTROL.COM
Name Server: NS48.DOMAINCONTROL.COM
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of whois database: 2017-08-05T10:31:39Z <<<

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  REGISTRAR GoDaddy.com, LLC

SERVERS

  SERVER com.whois-servers.net

  ARGS domain =productiverage.com

  PORT 43

  TYPE domain

DOMAIN

  NAME productiverage.com

  CHANGED 2016-06-30

  CREATED 2011-03-19

STATUS
clientDeleteProhibited https://icann.org/epp#clientDeleteProhibited
clientRenewProhibited https://icann.org/epp#clientRenewProhibited
clientTransferProhibited https://icann.org/epp#clientTransferProhibited
clientUpdateProhibited https://icann.org/epp#clientUpdateProhibited

NSERVER

  NS47.DOMAINCONTROL.COM 216.69.185.24

  NS48.DOMAINCONTROL.COM 208.109.255.24

  REGISTERED yes

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