Basic question but couldn't find an answer to this.
There is fake API testing tool located here
https://jsonplaceholder.typicode.com/todos
When I add a query like this
https://jsonplaceholder.typicode.com/todos?userId=4
I get a response
When I change the query to this
https://jsonplaceholder.typicode.com/todos?userId<4
it returns null
How would I query in the url userId that is less than 4?
You need to encode the '<' sign as a special character with its hexadecimal code ('<' is 3c) so your query becomes:
https://jsonplaceholder.typicode.com/todos?userId%3c4
Any special character in a url can be coded as % followed by its two-digit hexadecimal code.
EDIT: After trying the URL with my change, I was able to get the '<' sign decoded as I mentioned above. However, it doesn't seem to provide the expected return (all user IDs less than 4). It returns more user IDs than this. Maybe need to check the API docs to make sure that 'userId<4' is a correct field definition.
Related
(Update: still stuck after changes made from John's comment)
I am hoping for somebody to kindly try to explain in layman's terms how the signature is generated in the following example? I am pretty much stuck at this point.. I get the same result in an online hash generator (see picture below) and in my own code; but it differs from the example in the website (also pictured below).
https://www.gate.io/docs/apiv4/en/#authentication
edit: website seems only reachable through google search, direct link gives 404? So I attached the page as image, see below
Request: List all orders
GET /api/v4/futures/orders?contract=BTC_USD&status=finished&limit=50
HTTP/1.1
secret:
secret
resulting signature string (edit: updated, thanks #John Glenn)：
GET\n/api/v4/futures/orders\ncontract=BTC_USD&status=finished&limit=50\ncf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e\n1541993715
(note that in the example on the website, there are line breaks for readability)
Signature generated according to the example:
eae42da914a590ddf727473aff25fc87d50b64783941061f47a3fdb92742541fc4c2c14017581b4199a1418d54471c269c03a38d788d802e2c306c37636389f0
Explanation from the website:
Signature generation method is HexEncode(HMAC_SHA512(secret,
signature_string)), i.e., the hexadecimal digest output of HMAC-SHA512
with APIv4 secret as secret and signature string as message.
But if I put it into a HMAC-SHA512 generator (e.g., https://www.javainuse.com/hmac), the value I get is:
58000238bf5eef226028e108df259184f14bf3021eb27c324a808334d187da42c38f4510b30215ee9b0c05d6352396e99f67fa920079746bb4dfd70506592f6d
I suspect I am missing a very essential point but I am quite lost at this time..
thank you very much for your help!
Your resulting signature string is incorrect. According the to website, this is how you should build it, with each element separated by \n.
request verb
request URL
plain text query string from the URL
hash of the request body, which is an empty string in this case
the Unix timestamp in seconds
For your example, the resulting signature string values should be:
GET (but you have POST)
/api/v4/futures/orders
contract=BTC_USD&status=finished&limit=50 (MISSING from your string)
just use the empty string hash value from the example
use the Unix timestamp from the example
Solved!
The "\n" were not regular expressions but actual newlines in the example. In other words, the newlines should be entered as ascii newline character.
Then I got the same result in the generator as from the website.
I have review multiple instructions on URL-parameters which all suggest 2 approaches:
Parameters can follow / forward slashes or be specified by parameter name and then by parameter value. so either:
1) http://numbersapi.com/42
or
2) http://numbersapi.com/random?min=10&max=20
For the 2nd one, I provide parameter name and then parameter value by using the ?. I also provide multiple parameters using ampersand.
Now I have see the request below which works fine but does not fit into the rules above:
http://numbersapi.com/42?json
I understand that the requests sets 42 as a parameter but why is the ? not followed by the parameter name and just by the value. Also the ? seems to be used as an ampersand???
From Wikipedia:
Every HTTP URL conforms to the syntax of a generic URI. The URI generic syntax consists of a hierarchical sequence of five components:
URI = scheme:[//authority]path[?query][#fragment]
where the authority component divides into three subcomponents:
authority = [userinfo#]host[:port]
This is represented in a syntax diagram as:
As you can see, the ? ends the path part of the URL and starts the query part.
The query part is usually a &-separated string of name=value pairs, but it doesn't have to be, so json is a valid value for the query part.
Or, as the Wikipedia articles says it:
An optional query component preceded by a question mark (?), containing a query string of non-hierarchical data. Its syntax is not well defined, but by convention is most often a sequence of attribute–value pairs separated by a delimiter.
It is also fairly common for request processors to treat a name=value pair that is missing the = sign, as if the it was name=.
E.g. if you're writing Servlet code and call servletRequest.getParameter("json"), it would return an empty string ("") for that last URL in the question.
Web.HttpUtility.UrlEncode method in my project. When I am encoding name in English language then I got correct result. For example,
string temp = System.Web.HttpUtility.UrlEncode("Jewelry");
then I got exact result in temp variable. But if I wrote name in Russian language then I got different result.
string temp = System.Web.HttpUtility.UrlEncode("ювелирные изделия");
then I got value in temp variable like "%d1%8e%d0%b2%d0%b5%d0%bb%d0%b8%d1%80%d0%bd%d1%8b%d0%b5+%d0%b8%d0%b7%d0%b4%d0%b5%d0%bb%d0%b8%d1%8f"
Can anyone help me how to achieve exact name as per language?
Thank you!
Actually, the method has "done the right thing" for you!
It encodes non-ASCII characters so that it can be valid in all of the cases and transmit over the Internet. If you put your temp variable in an URL as a parameter, you will get your correct result at server side. That's what UrlEncode means for. Here your question is not a problem at all.
So please have a look at this link for further reading to understand about URL Encoding: http://www.w3schools.com/tags/ref_urlencode.asp
If you input that Russian word to the "URL Encoding Functions" part in the page I have given, it will return the same result as Web.HttpUtility.UrlEncode method does.
Can anyone help me how to achieve exact name as per language?
In short: not with that method, but it might depend on what is your exact goal.
In details:
In general URIs as defined by RFC 3986 (see Section 2: Characters) may contain any of the following characters: ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-._~:/?#[]#!$&'()*+,;=. Any other character needs to be encoded with the percent-encoding (%hh).
This is why UrlEncode produces
UrlEncode("Jewelry") -> "Jewelry"
UrlEncode("ювелирные изделия") -> "%d1%8e%d0%b2%d0%b5%d0%bb%d0%b8%d1%80%d0%bd%d1%8b%d0%b5+%d0%b8%d0%b7%d0%b4%d0%b5%d0%bb%d0%b8%d1%8f"
The string of "ювелирные изделия" contains characters that are not allowed in a URL as per RFC 3986.
Today, modern browsers could work with UTF-8 in URL it might be not necessary to use UrlEncode(). See example: http://jsfiddle.net/ybgt96ms/
In Solr I have a field dedicated to URLs. The URL field can be anywhere up to 2000 in length. However, I only ever need to search the first 200 characters.
Example URL:
https://www.google.co.uk/search/2014/here/?q=help+me&oq=stackoverflow&aqs=c
I've experimented over the last 2 weeks with Grams and various combinations of Tokenizers to no avail. I always seem to fall short. I would provide examples but they are all standard so no point cluttering this with non-working types.
The main problem seems to be with how Solr deals with punctuation. It treats non-A-z/0-9 characters as separators. How do I disable this for a field?
For example I can search: 'google' and get the correct result, but when I search 'google.co' nothing comes back. Same problem with most of the non-A-z/0-9 characters, it seems to treat them as a separator.
Everything needs to be *wildcard*searchable from 4char strings up to 200 char strings.
So the following search terms would return the above result. '&aqs','ow&aqs=','ps://www.goo','q=help+','2014/he'... etc
How would you define a field type for the URL wildcard use case?
You can use a string field for your url and use a filter that cuts it off to 200 characters.It can be a regex expressions also to keep only 200 characters for that field.
String field will match the exact tokens
I tried using Ruby's url_encode (doc here.)
It encodes http://www.google.com as http%3A%2F%2Fwww.google.com. But it turns out that I cannot open the latter via a browser. If so, what's the use of this function? What is it useful for, when the URL that it encodes can't even be opened?
A typical use is the HTTP GET method, in where you need a query String.
Query String 1:
valudA=john&valueB=john2
Actual value server get:
valueA : "john"
valueB : "john2"
url_encode is used to make the key-value pair enable to store the string which includes some non-ASCII encoded character such as space and special character.
Suppose the valueB will store my name, code 4 j, you need to encode it because there are some spaces.
url_encode("code 4 j")
code%204%20j
Query string 2:
valueA=john&valueB=code%204%20j
Actual value server get:
valueA: "john"
valueB: "code 4 j"
You can use url_encode to encode for example the keys/values of a GET request.
Here is an example of what a SO search query URL looks after encoding:
https://stackoverflow.com/questions/tagged/c%23+or+.net+or+asp.net
As you can see, url encoding appears to be applied only on the last part of the URL, after the last slash.
In general you cannot use url_encode on your entire URL or you will also encode the special characters in a normal URL like the :// in your example.
You can check a tutorial that explains how it works here: http://www.permadi.com/tutorial/urlEncoding/