# HTTP Client Post Call **URL:** \ **Category:** Ignition\ **Tags:** ignition81\ **Created:** [February 24, 2023, 3:11pm UTC](https://forum.inductiveautomation.com/t/http-client-post-call/70287 "2023-02-24T15:11:49Z")\ **Posts on this page:** 12\ **Page:** 1
**Author:** ![jfan](https://avatars.discourse-cdn.com/v4/letter/j/e8c25b/32.png) [@jfan](https://forum.inductiveautomation.com/u/jfan)\ **Post date:** [February 24, 2023, 3:11pm UTC](https://forum.inductiveautomation.com/t/http-client-post-call/70287/1 "2023-02-24T15:11:49Z")
Hi All, I am pretty new to using the Post Call method to post data. While I tried to use the httpClient function to post a request on the Boomi server, I got the following error saying the existing connection is forcibly closed by the remote host. Can anyone point me in the direction of why this error occurred? Here is my script: ```auto user = "user" password = "password" info = {"ProductPartNumber" : " ****", "FacilityPrefix" : "***", "SqlWhere": " *****"} url = "https:// ****.com/ws/rest/Ignition?messageType=GET_PRODUCT_SPEC" # Create the JythonHttpClient. client = system.net.httpClient(username=user, password=password, bypass_cert_validation = True) response = client.post(url, info) ``` Error: ```plaintext ... 38 common frames omitted Caused by: com.inductiveautomation.ignition.common.GenericTransferrableException: Unable to POST https://bil-boomi01dv.entegris.com/ws/rest/Ignition?messageType=GET_PRODUCT_SPEC?ProductPartNumber=+AEC010M1G3000T+&FacilityPrefix=LSP&SqlWhere=and+PRODUCT_SPEC.SPEC_TYPE+in+%28%27IC%27%2C%27TOC%27%2C%27LPC%27%29 at com.inductiveautomation.ignition.common.script.builtin.http.JythonHttpClient.send(JythonHttpClient.java:103) at com.inductiveautomation.ignition.common.script.builtin.http.InsecureJythonHttpClient.send(InsecureJythonHttpClient.java:37) at com.inductiveautomation.ignition.common.script.builtin.http.JythonHttpClient.post(JythonHttpClient.java:318) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.base/java.lang.reflect.Method.invoke(Unknown Source) at org.python.core.PyReflectedFunction. __call__ (PyReflectedFunction.java:190) ... 35 common frames omitted Caused by: com.inductiveautomation.ignition.common.GenericTransferrableException: An existing connection was forcibly closed by the remote host at java.net.http/jdk.internal.net.http.HttpClientImpl.send(Unknown Source) at java.net.http/jdk.internal.net.http.HttpClientFacade.send(Unknown Source) at com.inductiveautomation.ignition.common.script.builtin.http.JythonHttpClient.send(JythonHttpClient.java:101) ... 42 common frames omitted Caused by: com.inductiveautomation.ignition.common.GenericTransferrableException: An existing connection was forcibly closed by the remote host at java.base/sun.nio.ch.SocketDispatcher.read0(Native Method) at java.base/sun.nio.ch.SocketDispatcher.read(Unknown Source) at java.base/sun.nio.ch.IOUtil.readIntoNativeBuffer(Unknown Source) at java.base/sun.nio.ch.IOUtil.read(Unknown Source) at java.base/sun.nio.ch.IOUtil.read(Unknown Source) at java.base/sun.nio.ch.SocketChannelImpl.read(Unknown Source) at java.net.http/jdk.internal.net.http.SocketTube.readAvailable(Unknown Source) at java.net.http/jdk.internal.net.http.SocketTube$InternalReadPublisher$InternalReadSubscription.read(Unknown Source) at java.net.http/jdk.internal.net.http.SocketTube$SocketFlowTask.run(Unknown Source) at java.net.http/jdk.internal.net.http.common.SequentialScheduler$SchedulableTask.run(Unknown Source) at java.net.http/jdk.internal.net.http.common.SequentialScheduler.runOrSchedule(Unknown Source) at java.net.http/jdk.internal.net.http.common.SequentialScheduler.runOrSchedule(Unknown Source) at java.net.http/jdk.internal.net.http.SocketTube$InternalReadPublisher$InternalReadSubscription.signalReadable(Unknown Source) at java.net.http/jdk.internal.net.http.SocketTube$InternalReadPublisher$ReadEvent.signalEvent(Unknown Source) at java.net.http/jdk.internal.net.http.SocketTube$SocketFlowEvent.handle(Unknown Source) at java.net.http/jdk.internal.net.http.HttpClientImpl$SelectorManager.handleEvent(Unknown Source) at java.net.http/jdk.internal.net.http.HttpClientImpl$SelectorManager.lambda$run$3(Unknown Source) at java.base/java.util.ArrayList.forEach(Unknown Source) at java.net.http/jdk.internal.net.http.HttpClientImpl$SelectorManager.run(Unknown Source) ``` ---
**Author:** ![dkhayes117](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/dkhayes117/32/68344_2.png) [@dkhayes117](https://forum.inductiveautomation.com/u/dkhayes117)\ **Post date:** [February 24, 2023, 3:25pm UTC](https://forum.inductiveautomation.com/t/http-client-post-call/70287/2 "2023-02-24T15:25:54Z")
Please make sure you format code correctly when posting using the `` button. Try this ```auto user = "user" password = "password" data = {"ProductPartNumber" : " ****", "FacilityPrefix" : "***", "SqlWhere": " *****"} url = "https:// ****.com/ws/rest/Ignition?messageType=GET_PRODUCT_SPEC" # Create the JythonHttpClient. client = system.net.httpClient(username=user, password=password, bypass_cert_validation = True) response = client.post(url, data=data) ``` ---
**Author:** ![jfan](https://avatars.discourse-cdn.com/v4/letter/j/e8c25b/32.png) [@jfan](https://forum.inductiveautomation.com/u/jfan)\ **Post date:** [February 24, 2023, 3:43pm UTC](https://forum.inductiveautomation.com/t/http-client-post-call/70287/3 "2023-02-24T15:43:08Z")
got the same error. ---
**Author:** ![paul-griffith](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/paul-griffith/32/37249_2.png) [@paul-griffith](https://forum.inductiveautomation.com/u/paul-griffith)\ **Post date:** [February 24, 2023, 4:32pm UTC](https://forum.inductiveautomation.com/t/http-client-post-call/70287/4 "2023-02-24T16:32:21Z")
The _exact_ same error? The first error you posted looks like this: `https://xxx/ws/rest/Ignition?messageType=GET_PRODUCT_SPEC?ProductPartNumber=+AEC010M1G3000T+&FacilityPrefix=LSP&SqlWhere=and+PRODUCT_SPEC.SPEC_TYPE+in+%28%27IC%27%2C%27TOC%27%2C%27LPC%27%29` Which means you're sending your `data` dictionary as URL parameters, which is _probably_ not what your server is expecting; typically POST routes expect data in the request _body_. Can you post the actual error message (you may want to sanitize it, if you consider your URL sensitive) you get if you execute something like this: ```python user = "user" password = "password" client = system.net.httpClient(username=user, password=password, bypass_cert_validation = True) url = "https:// ****.com/ws/rest/Ignition" params = { "messageType": "GET_PRODUCT_SPEC" } data = { "ProductPartNumber" : " ****", "FacilityPrefix" : "***", "SqlWhere": " *****"} # Create the JythonHttpClient. response = client.post(url, params=params, data=data) ``` Note that the only error here is this: `An existing connection was forcibly closed by the remote host`, which is pretty clearly indicating the server isn't accepting your request; instead of returning an error code it's forcibly closing the socket. As an _aside_: > [@jfan](#): > > `"SqlWhere": " *****"` 😬 Accepting arbitrary strings as SQL input is [super dangerous](https://owasp.org/www-community/attacks/SQL_Injection) - I hope you know what you're doing. ---
**Author:** ![jfan](https://avatars.discourse-cdn.com/v4/letter/j/e8c25b/32.png) [@jfan](https://forum.inductiveautomation.com/u/jfan)\ **Post date:** [February 24, 2023, 5:01pm UTC](https://forum.inductiveautomation.com/t/http-client-post-call/70287/5 "2023-02-24T17:01:42Z")
This is the error after implementing what you recommended. It seems to me that they are the exact same error. ```auto com.inductiveautomation.ignition.common.script.JythonExecException Traceback (most recent call last): File "", line 2, in runAction File "", line 13, in specRuleTest java.io.IOException: java.io.IOException: Unable to POST https:// ****.com/ws/rest/Ignition?messageType=GET_PRODUCT_SPEC caused by org.python.core.PyException Traceback (most recent call last): File "", line 2, in runAction File "", line 13, in specRuleTest java.io.IOException: java.io.IOException: Unable to POST https:// ****.com/ws/rest/Ignition?messageType=GET_PRODUCT_SPEC caused by IOException: Unable to POST https:// ****.com/ws/rest/Ignition?messageType=GET_PRODUCT_SPEC caused by IOException: An existing connection was forcibly closed by the remote host caused by IOException: An existing connection was forcibly closed by the remote host ``` Thanks for pointing out the arbitrary strings as SQL input is dangerous, but the arbitrary strings as SQL input are developed by another team that manages the database. I was just asked to provide the data shown above to get the product info. ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [February 24, 2023, 5:11pm UTC](https://forum.inductiveautomation.com/t/http-client-post-call/70287/6 "2023-02-24T17:11:23Z")
If I had to guess, since I do because there’s not enough information available to us, I’d say this means either: - the server doesn’t like the data you’re providing - network or firewall issue Usually you’d get an HTTP error code when a server doesn’t like something about the data, but who knows. ---
**Author:** ![jfan](https://avatars.discourse-cdn.com/v4/letter/j/e8c25b/32.png) [@jfan](https://forum.inductiveautomation.com/u/jfan)\ **Post date:** [March 30, 2023, 5:49pm UTC](https://forum.inductiveautomation.com/t/http-client-post-call/70287/7 "2023-03-30T17:49:54Z")
Revisiting this topic, the issue above was due to connectivity to the destination server (Boomi). Although our team resolved the issue above, we would get HTTP code 500 from time to time. Should Ignition continue to post to the server until the post call returns code 200? Is there a better way to address the occasion where post call fails? Thanks! ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [March 30, 2023, 5:53pm UTC](https://forum.inductiveautomation.com/t/http-client-post-call/70287/8 "2023-03-30T17:53:48Z")
> [@jfan](#): > > Should Ignition continue to post to the server until the post call returns code 200? Certainly not. > [@jfan](#): > > Is there a better way to address the occasion where post call fails? Check the result and retry yourself. ---
**Author:** ![jfan](https://avatars.discourse-cdn.com/v4/letter/j/e8c25b/32.png) [@jfan](https://forum.inductiveautomation.com/u/jfan)\ **Post date:** [March 30, 2023, 6:28pm UTC](https://forum.inductiveautomation.com/t/http-client-post-call/70287/9 "2023-03-30T18:28:13Z")
This is supposed to be an automatic process to post the live process data to the server, which triggers another post call to store the data. In the case of the destination server being down or unavailable, is manually triggering the post call the only option? Does Ignition provide a similar method like store and forward for API calls? ---
**Author:** ![paul-griffith](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/paul-griffith/32/37249_2.png) [@paul-griffith](https://forum.inductiveautomation.com/u/paul-griffith)\ **Post date:** [March 30, 2023, 6:40pm UTC](https://forum.inductiveautomation.com/t/http-client-post-call/70287/10 "2023-03-30T18:40:28Z")
No. HTTP is a low level protocol. If you want to layer retry semantics on top of it, you can, but it's not something that there's any general standard for, so you have to create the logic yourself. ---
**Author:** ![jfan](https://avatars.discourse-cdn.com/v4/letter/j/e8c25b/32.png) [@jfan](https://forum.inductiveautomation.com/u/jfan)\ **Post date:** [April 18, 2023, 4:47pm UTC](https://forum.inductiveautomation.com/t/http-client-post-call/70287/11 "2023-04-18T16:47:08Z")
just ran into another issue, and Here is the script: ```auto client = system.net.httpClient(username=user, password=password, bypass_cert_validation = True) system.perspective.print(client) now = system.date.now() meas = [524, 124,24,4,2,1,0] for i in range(7): data = {"run_start_time": "03-24-2023 11:01" , "meas_time": now, "reported_meas": meas[i] , "analysis": "LPC", "component": "ch"+str(i+1), "upw_tool_id": 233 , "instrument_id": "LPC_001", "mfc_number": "A", "filter_pos": 1, "catalog_number": self.parent.custom.catalog, "lot_id": "300KT02", "serial_number": "004", "sequence_number": self.parent.custom.seq, "run_end_time": "", "results": "Pass", "collection_method": "Auto", "injection_type": "DATA", "run_id": 1299, "facility": "LSP" } response = client.post(boomiURL, data = data) ``` this is a test script for the post call. During one of the testings, the end server missed the last four messages from Ignition, but I could see on the designer console that the responses were good. However, the subsequent tests showed that all 7 messaged went through successfully to the end server. Is it okay to post messages continuously without delay? or Is it better to have delay between each post? ---
**Author:** ![paul-griffith](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/paul-griffith/32/37249_2.png) [@paul-griffith](https://forum.inductiveautomation.com/u/paul-griffith)\ **Post date:** [April 18, 2023, 5:10pm UTC](https://forum.inductiveautomation.com/t/http-client-post-call/70287/12 "2023-04-18T17:10:46Z")
That's up to your server. Best practice would be to change or add a new route on the server so that it can accept multiple result sets in one transaction; that way you're only going over the network once. You certainly _can_ artificially slow down your requests, if your server needs it. I can pretty much guarantee that the issue isn't the client, here.