Jsonp Request Timeout

We use cookies for various purposes including analytics. sunrise-sunset. esriRequest is a utility method to retrieve data from a web server. Defaults to an auto-generated random value. We decided to use JSONP for the Stripe. The core of the php-crud-api script is only 45 lines of code that routes a JSON REST API request, converts it into SQL, executes it and responds using JSON. esriRequest can handle the following formats:. HTTPS (SSL/TLS) Options¶ [ssl]¶ CouchDB supports TLS/SSL natively, without the use of a proxy server. A string overriding the callback function in a jsonp request: jsonpCallback: Specifies a name for the callback function in a jsonp request: password: Specifies a password to be used in an HTTP access authentication request. request({. WMS provides a standard interface for requesting a geospatial map image. The OMDb API is a RESTful web service to obtain movie information, all content and images on the site are contributed and maintained by our users. This actually happened the first time I loaded it up and ran it. Add a Formatters folder to your WebApi project and add the following class:. request() to do a cross domian json requeat, I want to know how to set the timeout, the defaule timeou is 30 sec? it is too long for me ! and I also to know how to set the timeout callback. jsonp : A string to override the callback function name in a JSONP request, jsonpCallback : Specifies. Of course this would not cancel the request. In the case of JSONP, the provider of the service has agreed to respond to your request with a script that can be loaded into the page using a tag, thus avoiding the same-origin limitation; that script will include the data you requested, wrapped in a callback function you provide. JavaScript can be a nightmare to debug: Some errors it gives can be very difficult to understand at first, and the line numbers given aren’t always helpful either. html page, we're going to make the ajax call to our simplejson. The callback gets two arguments: A request object, with a single term property, which refers to the value currently in the text. Learn more about Solr. - A big disadvantage of JSONP is that a script inclusion will pretty much block a javascript-heavy webapp; that's why I worked hard to try to minimize request numbers in exchange for static file generation time and CDN space which seemingly wasn't followed later and effectively blocks the site. com), and post (port 80 or 443 for http or https traffic, by default). request() to do a cross domian json requeat, I want to know how to set the timeout, the defaule timeou is 30 sec? it is too long for me ! and I also to know how to set the timeout callback. To create a CFC as REST web service, specify either. Step 1: Apply for API key The first thing you need to do is to apply for an API key. JSONP is short for "JSON with Padding" (I explain why, later). dojo/request/script deprecates dojo/io/script and is part of Dojo's Request API. Other security considerations. com, but instead redirected to a one-time URL at script. It uses a database of IP addresses that are associated to cities along with other relevant information like time zone, latitude and longitude. JSONP is a technique to get around these restrictions. In my article An Introduction to jQuery's Shorthand Ajax Methods, I discussed some of. With JQuery Here you do not have to explicitly pass in the callback parameter as JQuery passes the entire API response into an anonymous function. JSON has the advantage that is can be used to directly access the geonames webservice from javascript code, whereas using XML the browser will throw a security exception if an xml call to another webserver is made. php file to get the data. In order to access the Products API, you need a publisher account with Tradedoubler. Note that this timeout specifies the combined maximum duration of the connection time and the time to read the full response. fileModeMatch. Register at developer. This technique can be implemented with Ajax calls and also without Ajax Calls. Thank you so much. It involves creating a tag that loads an API endpoint, and which in turn returns some JSON wrapped in a function call. JSON (JavaScript Object Notation) is a lightweight data-interchange format. The only Services server I know that supports JSONP is the REST Server. This post will be a quick practical guide for the Angular HTTP Client module. Inside the builder, you get what amounts to a very easy to use. The problem is, the callback function is removed from the window context by jquery right after hitting the timeout. Note that this property is only valid for POST requests. Call a local script on the server /api/getWeather with the query parameter zipcode=97201 and replace the element #weather-temp's html with the returned text. For this reason, you won't be able to call the Etsy API directly using. With this site we hope to provide the League of Legends developer community with access to game data in a secure and reliable way. More than 1 year has passed since last update. For example, suppose you wanted to collect. Notice 2 changes here. There's a failure event, but that works with the timeout and I that's not really usable or the same. It's machine-to-machine (M2M) for the Internet Of Things (IOT) the way it was meant to be. NET MVC By Christos S. preventCache for cache prevention. When deserialization is disabled in the store, date-time strings are converted to Date objects at the widget level. It provides a method to request data from a server in a different domain, something prohibited by typical web browsers because of the Same origin policy. Handle the result #1, handle the result #2, handle the result #3. The Asynchronous behavior is the. If true, prevents esri. It would help to have wider context: Your example code, how you set up the request, what badge and video you're working on, etc. Configurator. Ajax jsonp call also needs to be supported on server side. Here is a simple updated version that takes care of that particular problem. The list is sorted from the oldest to the most recent request. As mentioned previously, JSONP support is not natively in the box with ASP. (maximum range: 365 days) To use this endpoint, simply specify your preferred time frame, consisting of a start_date and an end_date, both of the format YYYY-MM-DD. BoardGameGeek JSON APIs. However, intermittently, it's been giving me a timeout error: "Http request failed: the timeout was reached" Do you have any idea how i can solve this ?. To make a call for data to the WeatherSTEM API, you have to send a request in the form of a JSON object. There are many situations on the browser client when it would be desirable to make an AJAX call to a web-site or web service to fetch data. 하지만 AJAX 호출을 필요로 하는 기능에서 보안상 이유로 동일 서버 이외에는 접근할수가 없다. This article digs into the details of accessing an ASP. Of course this would not cancel the request. Inside the builder, you get what amounts to a very easy to use. outputFormat: String 'json' optional. xhrGet to append a unique query parameter to each request. "university+of+south+florida") 3) For single word you can use the word as is, however it is recommended to use phrases to narrow down the search. IIS sends the timeout response even though the script is actually still running. I'm just gonna post an answer that ajax jsonp XSS is not the right way to submit back-end requests if your server can already handle them and then under-the-hood pass that request to your proper server. boolean - Specify if request cache should be used for this request or not, defaults to index level setting. With JsonP, you do not need to have any additional server setup, you can handle it in your endpoint (using PHP, Java or whatever language you are using). 'chain' - Any calls made to start while the request is running will be chained up, and will take place as soon as the current request has finished, one after another. To define the language name by its code, use the Get the list of supported languages operation and set the ui parameter when calling. Is there a way to convert the JSON response which has nested deep structures to ABAP Internal table?. The only Services server I know that supports JSONP is the REST Server. This class avoids the time-consuming task of making a web request every time a mapping is needed by fetching the mapping of the whole assembly right from the instantiation. Its basic principle is that using web to call JS files is not affected by cross domain. Does your version of Ruby on Rails still receive security updates? Rails LTS provides security patches for old versions of Ruby on Rails (3. JSONP Service URL. Using unobtrusive AJAX in your MVC web applications can boost system’s performance. JSONP has some other limitations, too: It can only be used for GET requests, and there's no general way to prevent cross-site request forgeries*. This is simply a request using the OPTIONS HTTP verb. If the first argument is a url, an optional RequestOptions object can be provided as the 2nd argument. JsonpRequest A JSONP request that is waiting for a response. API v3 is a RESTful web service 2. JSONP is a mechanism that allows for making requests for data cross domain. SpeedCurve is a SPA (Single Page App) so we construct the charts dynamically using JSONP. The method of an HTTP request indicates, which CRUD operation is desired. Whether you’re looking for travel-time optimization, routing logistics, asset tracking, or all of the above, Bing Maps has an easy to use solution for your fleet management needs. In my article An Introduction to jQuery's Shorthand Ajax Methods, I discussed some of. JSONP is used to bypass the Cross-Domain Request boundaries, under which the scripts that run on one domain are restricted to access the data from another page on different domain. New api that gives the same functionalities of these functions were developed using CORS instead of jsonp. com' these are the steps you need to perform to get the code working again:. Ignore the result if a certain amount of time has elapsed. JSONP and JavaScript Using the JSONP interface with JavaScript. Play around with JSONP in nodeJS server and ABAP server In my blog Cross domain request in ABAP and Java with two workaround I introduce the step how to deal with Cross Domain issue using Cross-origin resource sharing ( CORS ) supported by almost all modern browsers. Note that this property is only valid for POST requests. The tag is allowed to load content from any domains without security restrictions. Using a third party service (get public IP) If you need to provide cross-browser support, you'll be unable to use RTCPeerConnection to retrieve your client private IP, therefore the only resource you have it's to depend from an external service (a request to a server, third party service or your autoimplemented service in your own server). This may not work if Jenkins is behind a proxy server that does request and result buffering; see JENKINS-47279 for details. The recently added jsonp support to jquery core has been highly instructive (thanks!). This sample demonstrates how to support JSON with Padding (JSONP) in WCF REST services. Access to this area is for users on our Extended Support Package (ESP). I've done some research and am aware of chaining the. Options that may be set at the request level are indicated by a "Y" in the "Request?" column. The if-none-match request header, after being parsed into its directives, does not match the etag response header. Zepto provides a very handy ajax function aptly named ajax. NET Web API. Fired by the loadContent method to dispatch a request to the provider. ajax() 的 jsonp 参数。 注意: JSONP 是 JSON 格式的扩展。它要求一些服务器端的代码. This tips demonstrates how to call the API in JavaScript without the need of jQuery or other frameworks. TUESDAY 2ND OF MAY 2017. So maybe you could try make your code send a request with every couple of letters that the user writes in to your text box until they get the result they want. ruby on rails - How to mock JSONP call in rspec request spec with capybara? -. add_renderer() method:. It works great, but we're always looking for ways to make the dashboards faster. xml, (set System variable ENABLE_JSONP=true and. There are some downsides, notably that JSONP only supports GET requests and that you still need a cooperative server. boolean - Specify if request cache should be used for this request or not, defaults to index level setting. A JSONP request is not sent via the XHR object like AJAX calls normally are. The script searches for callback functions in the response to detect JSONP endpoints. Response is the HTTP response object that we’ll send to the client. jsonpの場合、サーバサイドではjsonp形式で返すだけで特に設定は必要ない。ただし、jsonと違いJavaScriptのコードをクライアントサイドで直接実行するため、jsonpの提供APIに悪意のあるコードが含まれていた場合は恐ろしいことになる。. co provides a RESTful API that allows you to lookup the location of any IP address, both IPv4 and IPv6. A string overriding the callback function in a jsonp request: jsonpCallback: Specifies a name for the callback function in a jsonp request: password: Specifies a password to be used in an HTTP access authentication request. Questions: I am using jquery to build a request to the Twitter Search API. Finally, once you are ready to send the HTTP request, pick one of the following methods based on the expected content type of the result. The ESPN API supports XML and JSON / JSONP response formats. If this time passes the request is canceled and the promise rejected. Topsy offers an XML, JSON and JSONP version. If the first argument is a url, an optional RequestOptions object can be provided as the 2nd argument. Using this pattern we handle the JSONP call-back and its call-back is called JSON_CALLBACK. Since this option puts a hard limit on how long time a request is allowed to take, it has limited use in dynamic use cases with varying transfer times. Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Shapefile output¶. There are many situations on the browser client when it would be desirable to make an AJAX call to a web-site or web service to fetch data. jsonpの場合、リクエストが完了した時点で、jsonpで指定されている関数名が実行されるので、グローバルスコープであるwindowにその関数が定義されていない場合、関数名 is not a functionとなるはずです。. The callback can be passed using the callback or jsonp parameter. JSONP has to be supported by the source server (much like CORS). Does your version of Ruby on Rails still receive security updates? Rails LTS provides security patches for old versions of Ruby on Rails (3. This is also known as Same-origin policy of the web browsers. Request Object. recalibrate once advance next slide i'd happen each time panel opened or closed. While the library will emit a 'timeout' event when requests exceed the given timeout, node will continue processing the slow request until it terminates. Luckily, jQuery offers an inbuilt way to use JSONP in your script. Nevertheless, jQuery lets you make a JSONP request with $. ajax; Data type as JSONP; So, here we are passing our response from Server to another function named callbackReturn() with JSONP data type. Even small apps might have dozens of such interactions with the server. {"swagger":"2. "jsonp": JSONPとしてリクエストを呼び、callbackパラメータで指定した関数に呼び戻された値をJSONデータとして処理します。(jQuery 1. About the Riot Games API. client = shrimpy. As stated on Wikipedia, JSONP or "JSON with padding" is a complement to the base JSON data format, a usage pattern that allows a page to request and more meaningfully use JSON from a server other than the primary server. The JSONP approach is a workaround that consists of calling an external API with a DOM tag. TUESDAY 2ND OF MAY 2017. The request is aborted, meaning that even if the response arrives later on, your done callback is not called by jQuery. 'chain' - Any calls made to start while the request is running will be chained up, and will take place as soon as the current request has finished, one after another. This is not production quality code, and it is not running on a production quality server. 0","info":{"title":"Crossbrowsertesting. When a request is made, the server‐side API component will only return a response when either the call status has changed since the last request, or the long poll timeout period for the request has elapsed. The client will then conveniently handle the signing of each request, so you can focus on accessing the data and building tools with the data. JSONP is JSON data with a JavaScript callback method prefix. abort (request. The callback can be passed using the callback or jsonp parameter. The url I request is here is a snippet of the model qhich makes the request: $. esriRequest is a utility method to retrieve data from a web server. The recently added jsonp support to jquery core has been highly instructive (thanks!). Output format ("json" or "xml") to use for underlying webService. Whenever you're using an API that is hosted on another domain, you'll need to make sure you're using the jsonp version of the API. request [object] - Detailed info about the request. This is a common request in forums so I will show you how to use the new HttpClient class and the DataContractJsonSerializer to post JSON data to a web service. If the response isn't fully downloaded within that time, the request will be aborted. jsonpCallback - The value of the callback parameter to send in a query string when making a JSONP request. Using JSONP for cross domain requests. Even small apps might have dozens of such interactions with the server. If it times out, the err will be an Error object whose message is Timeout. JSONP requests will always return an HTTP status code of 200 but will reflect the real status code in the meta field of the JSON response. For reasons of security, OpenSocial gadgets are usually run in an isolated container (e. Reverse Ajax with Comet. Enables high-quality data collection, panel management and results analysis. It was a Thursday. request is an abstraction layer that can be used for any kind of request for data. Facing cross-domain issue, getting error_code 1000 in jsonp response while http status is 200 Can jsonp be not supported even if json is being returned ? Sencha touch Ajax Login using JSONP format. jsonp Override the callback function name in a JSONP request. Chinese snoops try tracking VPN users with fiendish JSONP trickery and use cross-site request forgery to expose users accessing restricted sites. js file), which then changes values depending on what else is sent through the AJAX request. The timeout option proposed by Galen is the best way. , an iframe), usually on another domain. xml, (set System variable ENABLE_JSONP=true and. Let's create a function which accepts the URL as the parameter and constructs the script tag at runtime and inserting the source from the remote server. I like searching in the chrome dev tools. com is separate from access to our Enterprise APIs that are described on this page. If you need to receive your API response wrapped inside a JSONP callback function, you can use the `callback` query parameter with any valid API route. Jsonp requests require explicit support on the server side. string - Time each individual bulk request should wait for shards that are unavailable. If you're asking for technical help, please be sure to include all your system info, including operating system, model number, and any other specifics related to the problem. Now-a-days, it's fairly common to request data in JSON format. com helps you discover the most compact-but-powerful microframeworks, and makes it easy for you to pick one that’ll work for you. Retrieve JSON data from MVC Controllers in ASP. Only if the XMLHttpRequest is made to ADomain. The if-none-match request header, after being parsed into its directives, does not match the etag response header. 警告:非专业使用其他 HTTP 库会导致危险的副作用,包括:安全缺陷症、冗余代码症、重新发明轮子症、啃文档症、抑郁、头疼、甚至死亡。. < Boolean > returnProgress: Optional: Indicates whether to return upload or download progress tracking. Timeout can be very useful as it is the only way to detect the failure of a JSONP request. js) to dynamically insert JavaScript into a Web page. timeout specifies how long the loader will attempt to load the string before the request is canceled. You can choose which format you want to have returned when sending an API request. Step Two: Making the JSONP call using zepto. Options that may be set at the request level are indicated by a "Y" in the "Request?" column. Although we are using JSONP here, testing Http and The mock backend connections property is an observable that emits an connection every time an API request is. We also need to make a change on server code to respond to JSONP request. The claims in a JWT are encoded as a JSON object that is used as the payload of a JSON Web Signature (JWS) structure or as the plaintext of a JSON Web Encryption (JWE) structure, enabling the claims to be digitally signed or integrity protected with a Message Authentication Code (MAC. io doesn't require any setup or sign-up— just publish and go. jsonpの場合、サーバサイドではjsonp形式で返すだけで特に設定は必要ない。ただし、jsonと違いJavaScriptのコードをクライアントサイドで直接実行するため、jsonpの提供APIに悪意のあるコードが含まれていた場合は恐ろしいことになる。. com to example2. Last updated 2 years ago by lancercomet. Facing cross-domain issue, getting error_code 1000 in jsonp response while http status is 200 Can jsonp be not supported even if json is being returned ? Sencha touch Ajax Login using JSONP format. Some options may also be set at the request level (i. Access to this area is for users on our Extended Support Package (ESP). Data has to be provided via GET. An alternative is to use the YQL module to query a YQL table that can return the data that you need. Inside the builder, you get what amounts to a very easy to use. We will be using the new @angular/common/http module, but a good part of this post is also applicable to the previous @angular/http module. Since then, I've noticed that any time a request times out and ends up throwing a 500, the load balancer sends the same request to our other server. com Selenium API","description":"What's in this version: 1. In other words, using standard Ajax, it would be impossible to send a request from a web page, that is running on a laptop, to the Arduino web server, because the two are on different machines with different IP addresses, JSONP instead permits to avoid this problem. This service offers a REST API allowing to get a visitor IP address and to query location information from any IP address. Fortunately, most websites/server configurations support JSONP (partly because of the limitations of CORS, and partly because it is an older technology compared to CORS) Because JSONP is not an AJAX request, you cannot make synchronous requests. in your Jenkins server-side logs ( JENKINS_URL/log/all). Set the total request timeout duration. You received this message because you are subscribed to the Google Groups "d3-js" group. Can't get enough? Special thanks to Time Zone Converter. AngularJs is having its own callback pattern, so it will follow that pattern to handle jsonp callbacks. There's a failure event, but that works with the timeout and I that's not really usable or the same. accepts(types) Checks if the specified content types are acceptable, based on the request’s Accept HTTP header field. The problem is, the callback function is removed from the window context by jquery right after hitting the timeout. This is as simple as setting the "callback" query parameter with your function name in your request. JSONP or "JSON with padding" is a communication technique used in JavaScript programs running in web browsers to request data from a server in a different domain, something prohibited by typical web browsers because of the same-origin policy. Fired by the loadContent method to dispatch a request to the provider. Times out a request in the Connect/Express application framework. A nice and simple solution to that problem is JSON with padding, also known as JSONP. Without doubt, Ajax has taken web development by storm and it's one of the most successful paradigms ever. If the difference between server time and time, specified in parameter, will be greater than 5 minutes, request will be denied. Check "Usage limits and attribution" section below for more information. The left part of the editor displays the request contents, the right part displays response data. The url I request is here is a snippet of the model qhich makes the request: $. How can I make a call to REST API using JQuery, Cross domain to get the list of issues in Jira? Katie Jordan Oct 13, 2012 I'm developing a SharePoint2013 application in which I can only use Client Scripts (such as JQuery). I need to call a service to retrieve the available values for a select in a form I am creating. The client is less helpful and seems to just time out silently. Request a bearer token that will allows them to query the Opendatasoft platform APIs for a limited amount of time. This class can encode and generate a response to JSONP request. timeout - Time in ms after which a. callback specifies the name of the callback function used to retrieve the data. Which gives the function multiple callback options, like done and fail. JSONP (JSON with Padding) was created as a workaround to the cross domain problem. Idle timeout: If no message is sent during a certain period, the connection is considered idle and closed. The type option is ignored if dataType is set to "jsonp". JSONP does not work with JSON-formatted results. esriRequest can handle the following formats:. < Boolean > returnProgress: Optional: Indicates whether to return upload or download progress tracking. JSONP in combination with a timeout causes errors #2317. Request timeout: the server should answer the request under a certain response time. Example - set the HTTP verb of the request. Best practice is to ensure that JSONP scripts are read-only and only return non-sensitive information. Reverse Ajax with Comet. making a JSONP call to the CKAN API returns the wrong mime type (#4022) Deleting a resource sets datastore_active=False to all resources and overrides their extras (#4042) Deleting first Group and Organization custom field is not possible (#4094) Changes and deprecations: The default templates included in CKAN core have been updated to use. AngularJS is what HTML would have been, had it been designed for building web-apps. In order to get a fare, TFF currently requires that you provide an entity handle to denote the area in which the fare originates. There are two things that need to be done here: Configure your AJAX request to pass cookies; Set the response headers to conform with CORS; Configuring the AJAX Request. Creating a Monster Service. Let's understand more how this works. Dave mentions in the video that you must "check the response in the normal success callback to see how the server responded". API documentation. As mentioned previously, JSONP support is not natively in the box with ASP. JSONP is a JSONP renderer factory helper which implements a hybrid JSON/JSONP renderer. It is equivalent to doing a query for a single DOI using the q parameter, e. Since this option puts a hard limit on how long time a request is allowed to take, it has limited use in dynamic use cases with varying transfer times. 1 client sends a request which includes a request body, but which does not include an Expect request-header field with the "100-continue" expectation, and if the client is not directly connected to an HTTP/1. With JsonP, you do not need to have any additional server setup, you can handle it in your endpoint (using PHP, Java or whatever language you are using). This will fetch user prayer times with automatically selecting the location for user. There are some downsides, notably that JSONP only supports GET requests and that you still need a cooperative server. Description. Implementing Without Ajax Generally, most developers not aware that JSONP request can even do without any Ajax request with my experience. fileModeMatch. November 14, 2014 3:15 am | 2 Comments. If the response isn't fully downloaded within that time, the request will be aborted. If you don't know the Node. That chain was set up on much of our other code, but not these ones for some reason, probably due to laziness or things being rushed. Cookies are important to the proper functioning of a site. We make a JSONP request by c…. Here is a simple updated version that takes care of that particular problem. Yes, JSON Generator can JSONP:) Supported HTTP methods are: GET, POST, PUT, OPTIONS. A Boolean property that is true if the request’s X-Requested-With header field is “XMLHttpRequest”, indicating that the request was issued by a client library such as jQuery. Data has to be provided via GET. If the difference between server time and time, specified in parameter, will be greater than 5 minutes, request will be denied. This class can encode and generate a response to JSONP request. unlike JSONP, where HTTPS. https, for example), hostname (example1. Jsonp uses this feature to realize cross domain data request. ajax( options ) method loads a remote page using an HTTP request. It works great, but we're always looking for ways to make the dashboards faster. 1+ timeout (default: 0): request timeout in milliseconds, 0 for no timeout. In order to get a fare, TFF currently requires that you provide an entity handle to denote the area in which the fare originates. SpeedCurve is a SPA (Single Page App) so we construct the charts dynamically using JSONP. Does your version of Ruby on Rails still receive security updates? Rails LTS provides security patches for old versions of Ruby on Rails (3. Join Ray Villalobos for an in-depth discussion in this video, Communicating across sites with JSONP, part of JavaScript and JSON: Integration Techniques. For example, suppose you wanted to collect. Jquery Ajax Json Callback Example This is the most powerful of all the jQuery Ajax functions. It’s this capability that makes JSON so incredibly useful, as it opens up a lot of doors that were previously difficult to work around. It would help to have wider context: Your example code, how you set up the request, what badge and video you're working on, etc. Step Two: Making the JSONP call using zepto. JSONP always uses GET requests. Can you show the code of how the web service returns the response? Basically the Ajax jsonp call adds an additional parameter callback to web service call, which you need to use to wrap up the response. And sometimes that data can be in one of multiple formats: plain text, JSON, XML, your own data format, a binary file, … Accessing the HTTP headers is done using the request. So by moving from Ext. New api that gives the same functionalities of these functions were developed using CORS instead of jsonp. Recently, our systems administrators installed F5 load balancers. It works by tracking the uploads proxied by NGINX to upstream servers without analysing the uploaded content and offers a web API to report. A string overriding the callback function in a jsonp request: jsonpCallback: Specifies a name for the callback function in a jsonp request: password: Specifies a password to be used in an HTTP access authentication request. Want to add your own? Fork this site on GitHub, add your framework to data. Follow the pattern for subscribing to observables and use the RxJS map operator to transform the response before using the async pipe to manage the results. Performs any type of http request. time [number] - Total elapsed time of the request in milliseconds. - Of course they are from different origin, i. The only Services server I know that supports JSONP is the REST Server. 03/30/2017; 2 minutes to read +6; In this article. In other words, using standard Ajax, it would be impossible to send a request from a web page, that is running on a laptop, to the Arduino web server, because the two are on different machines with different IP addresses, JSONP instead permits to avoid this problem. Last week, I had to create a page that would monitoring another server for up-time (during an intensive data transfer process that was crashing out the server from time to time and would need to be re-started). Coordinating multiple ajax requests with jquery. The fact-checkers, whose work is more and more important for those who prefer facts over lies, police the line between fact and falsehood on a day-to-day basis, and do a great job. Today, my small contribution is to pass along a very good overview that reflects on one of Trump’s favorite overarching falsehoods. Namely: Trump describes an America in which everything was going down the tubes under  Obama, which is why we needed Trump to make America great again. And he claims that this project has come to fruition, with America setting records for prosperity under his leadership and guidance. “Obama bad; Trump good” is pretty much his analysis in all areas and measurement of U.S. activity, especially economically. Even if this were true, it would reflect poorly on Trump’s character, but it has the added problem of being false, a big lie made up of many small ones. Personally, I don’t assume that all economic measurements directly reflect the leadership of whoever occupies the Oval Office, nor am I smart enough to figure out what causes what in the economy. But the idea that presidents get the credit or the blame for the economy during their tenure is a political fact of life. Trump, in his adorable, immodest mendacity, not only claims credit for everything good that happens in the economy, but tells people, literally and specifically, that they have to vote for him even if they hate him, because without his guidance, their 401(k) accounts “will go down the tubes.” That would be offensive even if it were true, but it is utterly false. The stock market has been on a 10-year run of steady gains that began in 2009, the year Barack Obama was inaugurated. But why would anyone care about that? It’s only an unarguable, stubborn fact. Still, speaking of facts, there are so many measurements and indicators of how the economy is doing, that those not committed to an honest investigation can find evidence for whatever they want to believe. Trump and his most committed followers want to believe that everything was terrible under Barack Obama and great under Trump. That’s baloney. Anyone who believes that believes something false. And a series of charts and graphs published Monday in the Washington Post and explained by Economics Correspondent Heather Long provides the data that tells the tale. The details are complicated. Click through to the link above and you’ll learn much. But the overview is pretty simply this: The U.S. economy had a major meltdown in the last year of the George W. Bush presidency. Again, I’m not smart enough to know how much of this was Bush’s “fault.” But he had been in office for six years when the trouble started. So, if it’s ever reasonable to hold a president accountable for the performance of the economy, the timeline is bad for Bush. GDP growth went negative. Job growth fell sharply and then went negative. Median household income shrank. The Dow Jones Industrial Average dropped by more than 5,000 points! U.S. manufacturing output plunged, as did average home values, as did average hourly wages, as did measures of consumer confidence and most other indicators of economic health. (Backup for that is contained in the Post piece I linked to above.) Barack Obama inherited that mess of falling numbers, which continued during his first year in office, 2009, as he put in place policies designed to turn it around. By 2010, Obama’s second year, pretty much all of the negative numbers had turned positive. By the time Obama was up for reelection in 2012, all of them were headed in the right direction, which is certainly among the reasons voters gave him a second term by a solid (not landslide) margin. Basically, all of those good numbers continued throughout the second Obama term. The U.S. GDP, probably the single best measure of how the economy is doing, grew by 2.9 percent in 2015, which was Obama’s seventh year in office and was the best GDP growth number since before the crash of the late Bush years. GDP growth slowed to 1.6 percent in 2016, which may have been among the indicators that supported Trump’s campaign-year argument that everything was going to hell and only he could fix it. During the first year of Trump, GDP growth grew to 2.4 percent, which is decent but not great and anyway, a reasonable person would acknowledge that — to the degree that economic performance is to the credit or blame of the president — the performance in the first year of a new president is a mixture of the old and new policies. In Trump’s second year, 2018, the GDP grew 2.9 percent, equaling Obama’s best year, and so far in 2019, the growth rate has fallen to 2.1 percent, a mediocre number and a decline for which Trump presumably accepts no responsibility and blames either Nancy Pelosi, Ilhan Omar or, if he can swing it, Barack Obama. I suppose it’s natural for a president to want to take credit for everything good that happens on his (or someday her) watch, but not the blame for anything bad. Trump is more blatant about this than most. If we judge by his bad but remarkably steady approval ratings (today, according to the average maintained by 538.com, it’s 41.9 approval/ 53.7 disapproval) the pretty-good economy is not winning him new supporters, nor is his constant exaggeration of his accomplishments costing him many old ones). I already offered it above, but the full Washington Post workup of these numbers, and commentary/explanation by economics correspondent Heather Long, are here. On a related matter, if you care about what used to be called fiscal conservatism, which is the belief that federal debt and deficit matter, here’s a New York Times analysis, based on Congressional Budget Office data, suggesting that the annual budget deficit (that’s the amount the government borrows every year reflecting that amount by which federal spending exceeds revenues) which fell steadily during the Obama years, from a peak of $1.4 trillion at the beginning of the Obama administration, to $585 billion in 2016 (Obama’s last year in office), will be back up to $960 billion this fiscal year, and back over $1 trillion in 2020. (Here’s the New York Times piece detailing those numbers.) Trump is currently floating various tax cuts for the rich and the poor that will presumably worsen those projections, if passed. As the Times piece reported: