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How to build a query string for a URL in C#?

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You can create a new writeable instance of HttpValueCollection by calling System.Web.HttpUtility.ParseQueryString(string.Empty), and then use it as any NameValueCollection. Once you have added the values you want, you can call ToString on the collection to get a query string, as follows: NameValueCollection queryString = System.Web.HttpUtility.ParseQueryString(string.Empty); queryString.Add(“key1”, “value1”); queryString.Add(“key2”, “value2”); return queryString.ToString(); // Returns “key1=value1&key2=value2”, all … Read more

Capturing URL parameters in request.GET

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When a URL is like domain/search/?q=haha, you would use request.GET.get(‘q’, ”). q is the parameter you want, and ” is the default value if q isn’t found. However, if you are instead just configuring your URLconf**, then your captures from the regex are passed to the function as arguments (or named arguments). Such as: (r’^user/(?P<username>\w{0,50})/$’, … Read more

Which characters make a URL invalid?

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In general URIs as defined by RFC 3986 (see Section 2: Characters) may contain any of the following 84 characters: ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-._~:/?#[]@!$&'()*+,;= Note that this list doesn’t state where in the URI these characters may occur. Any other character needs to be encoded with the percent-encoding (%hh). Each part of the URI has further restrictions about … Read more

How to get the full URL in Express?

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The protocol is available as req.protocol. docs here Before express 3.0, the protocol you can assume to be http unless you see that req.get(‘X-Forwarded-Protocol’) is set and has the value https, in which case you know that’s your protocol The host comes from req.get(‘host’) as Gopal has indicated Hopefully you don’t need a non-standard port … Read more

How do I create a URL shortener? [closed]

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I would continue your “convert number to string” approach. However, you will realize that your proposed algorithm fails if your ID is a prime and greater than 52. Theoretical background You need a Bijective Function f. This is necessary so that you can find a inverse function g(‘abc’) = 123 for your f(123) = ‘abc’ … Read more

How to get URL parameter using jQuery or plain JavaScript?

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Best solution here. var getUrlParameter = function getUrlParameter(sParam) { var sPageURL = window.location.search.substring(1), sURLVariables = sPageURL.split(‘&’), sParameterName, i; for (i = 0; i < sURLVariables.length; i++) { sParameterName = sURLVariables[i].split(‘=’); if (sParameterName[0] === sParam) { return sParameterName[1] === undefined ? true : decodeURIComponent(sParameterName[1]); } } return false; }; And this is how you can use … Read more

What’s the shebang/hashbang (#!) in Facebook and new Twitter URLs for?

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This technique is now deprecated. This used to tell Google how to index the page. https://developers.google.com/webmasters/ajax-crawling/ This technique has mostly been supplanted by the ability to use the JavaScript History API that was introduced alongside HTML5. For a URL like www.example.com/ajax.html#!key=value, Google will check the URL www.example.com/ajax.html?_escaped_fragment_=key=value to fetch a non-AJAX version of the contents.

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