Develop Reference

Consuming RESTful pagination information from Link header RFC8288

I am interfacing with Shopify and they use RESTful API. When I request a resource that returns an array of items, they use RFC8288 pagination format.
For example, https://example.com/api/inventory_levels.json?limit=10 returns 10 entities along with the following response header:
Link: <https://example.com/api/inventory_levels.json?limit=10&page_info=eyJs9pZHMiO>;
rel="previous", <https://example.com/api/inventory_levels.json?limit=10&page_info=MiZHeyJs9pO>; rel="next"
Appearantly if I want to retrieve all entites from that resource I need to iterate through the 'next' URL until there's no more 'next' returning. But how am I going to parse these info using JAVA or C# code? I could use a regular expression like <(?<next_url>.*)>; rel="next" to retrieve the 'next_url' from it. But it feels like re-inventing the wheel and not robust.
If this is a well-defined feature, shouldn't there be a readily available library/infrastructure that could be used? I just don't want to be caught by surprise if one day the formatting shows up different (like having an extra space and such) and, whilst abiding to the RFC defination, breaks my hastily scrambled up RegEx solution.
Suggestion welcome for Java or C#.

Yummly API returns strange characters in JSON response (Android)

I access the Yummly database for recipes in my Android app using the html query:
http://api.yummly.com/v1/api/recipes?_app_id=MY-APP-ID_app_key=MY-APP-KEY&q=KEYWORD
Even though their documentation states that the GET requests are returned in the UTF-8 format, I find some strange characters in the code, like: Pots de Creme a l’Orange.
The problem is not only limited to my Android application, but the same is shown in the Chrome browser. Funnily enough, when I tried opening it in Internet Explorer, it appeared to be ok: Pots de Creme a l’Orange, but there were other things like crème fraĂ®che, which in Chrome appears sometimes as Crème Fraîche and sometimes correctly as Crème Fraîche.
What is the difference between the browsers that makes them interpret the response in different ways?
And, more importantly, what can be done in Android/Java to eliminate this issue? Do you have any ideas?
In Android I use HttpGet to fetch the data from server and then I pass it to a JSONObject.

I work for Yummly. There was an inconsistency in the way we handle these things, but it should be fixed now.
By way of explanation, the &; syntax is SGML/XML/HTML entities which are used to escape certain characters. See here for example. For users of most browsers, whether the document contains a & or & makes not difference and so we weren't thorough enough in normalizing them. But for an app such as yours, obviously it does make a difference and we've added a more thorough normalization. Everything you get from the API should not be UTF8 without any HTML entities.
Just for reference, Apache Commons Lang has a handy Java utility for this type of thing

How to implement custom search on the server database in Android 2.3?

I have to implement custom search in my application for android 2.3.I have some EditText in which user type one letter and then I send response to the server, retrieve all the results matches this one letter and then I need to display them in a list. When user types second button I also need to send new response and refresh data and so on.
The question how can I do this in Android 2.3? What should i use?

This seems to be too open ended with too many questions to give a really helpful answer.
What you use in your app will heavily depend on how the server's API is expecting you to communicate. I, for one, am all for hiding the specifics of what a server does from the application and put all the "smarts" behind the API. So a query like:
http:/blah.com/getresults?search=a
would result in whatever matches 'a'. If it is searching a MySql Db, processing a Google search, or accessing files on the system doesn't matter.
Your code needs to worry about the interface to the API to make queries and processing the results, whether they're free formatted text, JSON objects, or whatever.
Maybe rewording your question or provide information on what you know would help.

Java - Extracting plaintext from web-page source code (getting massive quantities of lyrics from website)

O community, I'm in the process of writing the pseudocode for an application that extracts song lyrics from a remote host (web-server, not my own) by reading the page's source code.
This is assuming that:
Lyrics are being displayed in plaintext
Portion of source code containing lyrics is readable by Java front-end application
I'm not looking for source code to answer the question, but what is the technical term used for querying a remote webpage for plaintext content?
If I can determine the webpage naming scheme, I could set the pointer of the URL object to the appropriate webpage, right? The only limitations would be irregular capitalization, and would only be effective if the plaintext was found in EXACTLY the same place.
Do you have any suggestions?
I was thinking something like this for "Buck 65", singing "I look good"
URL url = new URL(http://www.elyrics.net/read/b/buck-65-lyrics/i-look-good-lyrics.html);
I could substitute "buck-65-lyrics" & "i-look-good-lyrics" to reflect user input?
Input re-directed to PostgreSQL table
Current objective:
User will request name of {song, artist, album}, Java front-end will query remote webpage
Full source code (containing plaintext) will be extracted with Java front-end
Lyrics will be extracted from source code (somehow)
If song is not currently indexed by PostgreSQL server, will be added to table.
Operations will be made on the plaintext to suit the objectives of the program
I'm only looking for direction. If I'm headed completely in the wrong direction, please let me know. This is only for the pseudocode. I'm not looking for answers, or hand-outs, I need assistance in determining what I need to do. Are there external libraries for extracting plaintext that you know of? What technical names are there for what I'm trying to accomplish?
Thanks, Tyler

This approach is referred to as screen or data scraping. Note that employing it often breaks the target service's terms of service. Usually, this is not a robust approach, which is why API-like services with guarantees about how they operate are preferable.
Your approach sounds like it will work for the most part, but a few things to keep in mind.
If the web service you're interacting with requires a very precise URL scheme, you should not feed your user-provided data directly into it, since it is likely to be muddied by missing words, abbreviations, or misspellings. You might be better off doing some sort of search, first, and using that search's best result.
Reading HTML data is more complicated than you think. Use an existing library like jsoup to assist you.

The technical term to extract content from a site is web scraping, you can google that. There are a lot of online libraries, for java there is jsoup. Though its easy to write your own regex.
1st thing I would do i use curl and get the content from the site just for testing, this will give you a fair idea of what to do.

You will have to use a HTML parser. One of the most popular is jsoup.
Take care abut the legal aspect fo what you you do ;)

CEP: source for real-time events or data feeds?

I am searching for free event sources that I can use within my java-application.
I am looking for something similar to YahooFinance, where one can query a bunch of stock info and retrieve the result as csv.
Ideally, an API or a URL with some query string would be perfect.

How about SuperFeedr?
You could also run some SPARQL-query on some SPARQL-Endpoint and "feed" the result back to your application. Here is a list of some endpoints (here including uptime and availability stats).
Twitter also offers an Streaming-API, where one can listen for status changes etc. Another way could be to implement some HTML-crawler that extracts interesting facts from webpages, but that's probably not what you are looking for...
Kind of related:
Flickr API - observe activities on flickr
SO - Cricket API

for this you can use Rss4j api which provide both read feed and also create you own feed.
hope this will help you