I've been trying to find a solution for ages with no success. On our app, customers submit a form and on the next page we process it. Sometimes though the data never arrives. This seems to happen for just a few of our customers. Seems to happen with IE7 and using a proxy.
Here's some headers, note the HTTP_VIA:
X-REWRITE-URL: /process.asp?r=699743
APPL_MD_PATH: /LM/W3SVC/31555/ROOT
APPL_PHYSICAL_PATH: C:\inetpub\vhosts\mysite.com\httpdocs\
AUTH_PASSWORD:
AUTH_TYPE:
AUTH_USER:
CERT_COOKIE:
CERT_FLAGS:
CERT_ISSUER:
CERT_KEYSIZE:
CERT_SECRETKEYSIZE:
CERT_SERIALNUMBER:
CERT_SERVER_ISSUER:
CERT_SERVER_SUBJECT:
CERT_SUBJECT:
CONTENT_LENGTH: 0
CONTENT_TYPE: application/x-www-form-urlencoded
GATEWAY_INTERFACE: CGI/1.1
HTTPS: off
HTTPS_KEYSIZE:
HTTPS_SECRETKEYSIZE:
HTTPS_SERVER_ISSUER:
HTTPS_SERVER_SUBJECT:
INSTANCE_ID: 31555
INSTANCE_META_PATH: /LM/W3SVC/31555
LOCAL_ADDR: XXX.XXX.XXX.XXX
LOGON_USER:
PATH_INFO: /process.asp
PATH_TRANSLATED: C:\inetpub\vhosts\mysite.com\httpdocs\process.asp
QUERY_STRING: r=699743
REMOTE_ADDR: YYY.YYY.YYY.YYY
REMOTE_HOST: YYY.YYY.YYY.YYY
REMOTE_USER:
REQUEST_METHOD: POST
SCRIPT_NAME: /process.asp
SERVER_NAME: www.mysite.com
SERVER_PORT: 80
SERVER_PORT_SECURE: 0
SERVER_PROTOCOL: HTTP/1.1
SERVER_SOFTWARE: Microsoft-IIS/7.0
URL: /process.asp
HTTP_CONNECTION: Keep-Alive
HTTP_PRAGMA: no-cache
HTTP_VIA: 1.1 WEBCACHE-2
HTTP_CONTENT_LENGTH: 0
HTTP_CONTENT_TYPE: application/x-www-form-urlencoded
HTTP_ACCEPT: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/x-ms-application, application/x-ms-xbap, application/vnd.ms-xpsdocument, application/xaml+xml, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*
HTTP_ACCEPT_LANGUAGE: en-gb
HTTP_COOKIE: ASPSESSIONIDQCKSDCTS=FENMPCMDCHEOENGOJPGDGPLN;
HTTP_HOST: www.mysite.com
HTTP_REFERER: http://www.mysite.com/theform.asp
HTTP_USER_AGENT: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 2.0.50727; .NET CLR 1.1.4322; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022)
HTTP_UA_CPU: x86
HTTP_X_REWRITE_URL: /process.asp?r=699743
We've been having the same problem.
POST requests from IE7/IE8 that go through ISA proxy are sometimes (maybe one time in 50) missing the POST data, and have a content-length of 0.
This is a known issue with ISA - see http://support.microsoft.com/kb/942638 which provides a fix.
I had similar problem today and all answers on topic end up with Windows NTLM answer. I had Linux and Chrome, POST always got CONTENT_LENGTH=0 and I was debugging in C++ code to understand what I did wrong. As I finally found out, I was missing name attribute in <input ..../> fields. Without names nothing was submitted. Hope it helps someone who looks for similar issue.
Related
I have a website hosted served by IIS 10 on a Windows Server (2019) running Plesk. The site is mainly Classic ASP. I have a staging subdomain at staging.example.com, with the production site at www.example.com.
The two are fairly strictly separated, except that I don’t store image files, PDFs and such things on the staging server; I have a URL rewrite directive that redirects to the production site with a 302 status based on the URL not matching the following regex:
\.(php|asp|js|css|csv|json|htm|html|svg|svgz)(\?.+)?$
This generally works well: ASP pages are served from the staging site when the staging URL is called, but images on the page are pulled from the production site.
Except that there’s one ASP file which – for some reason – gives a 302 and redirects to the production site no matter what I do. The file exists in both locations. I’ve tested the URL in the pattern tester provided in the IIS URL-rewrite section, and it matches the pattern (meaning it shouldn’t redirect).
When I trace the request (that is, the initial request to the staging URL) in Firefox’s browser console, I get the following response headers (redacted):
HTTP/2 302 Found
cache-control: no-cache
content-type: text/html
location: https://www.example.com/path/to/file.asp
server: Microsoft-IIS/10.0
set-cookie: ASPSESSION****=********; secure; path=/
x-powered-by: ASP.NET
x-powered-by-plesk: PleskWin
date: Sun, 19 Dec 2021 18:52:05 GMT
content-length: 201
Accept
text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Encoding
gzip, deflate, br
Accept-Language
en-US,en;q=0.5
Authorization
Basic *************
Connection
keep-alive
Cookie
[cookies]
Host
staging.example.com
Referer
https://staging.example.com/path/to/file.asp
Sec-Fetch-Dest
document
Sec-Fetch-Mode
navigate
Sec-Fetch-Site
same-origin
Sec-Fetch-User
?1
Upgrade-Insecure-Requests
1
User-Agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:96.0) Gecko/20100101 Firefox/96.0
I’ve painstakingly gone through the entire file and all the file includes within it, and I can’t find any kind of Response.Redirect in any of them that might be responsible.
So it seems it’s IIS that’s redirecting with a 302… despite the fact that there doesn’t seem to be a directive that tells it to do this.
Is there a way to trace exactly what on the server is causing this 302 for one specific file? Some sort of tracing mechanism that tells me where the request gets passed on to before the 302 response is returned?
Update 26 Dec
Based on samwu’s comment, I’ve enabled Failed Request Tracing for the page, and looking through the resulting .frb file, it’s clear that none of the rewrite conditions are met – they all have succeed: false. It seems the redirect is not happening in the WWW Server at all, in fact, but in the ISAPI extension. This is the only place that the production site URL is mentioned at all in the request trace (except of course in the GENERAL_RESPONSE_HEADER section at the very end):
ISAPI_START
MODULE_SET_RESPONSE_SUCCESS_STATUS ModuleName="IsapiModule", Notification="EXECUTE_REQUEST_HANDLER", HttpStatus="302", HttpReason="Object moved"
GENERAL_SET_RESPONSE_HEADER HeaderName="Location", HeaderValue="https://www.example.com/path/to/file.asp", Replace="false"
GENERAL_SET_RESPONSE_HEADER HeaderName="Content-Length", HeaderValue="201", Replace="false"
GENERAL_SET_RESPONSE_HEADER HeaderName="Content-Type", HeaderValue="text/html", Replace="false"
GENERAL_SET_RESPONSE_HEADER HeaderName="Cache-control", HeaderValue="no-cache", Replace="false"
NOTIFY_MODULE_COMPLETION ModuleName="IsapiModule", Notification="EXECUTE_REQUEST_HANDLER", fIsPostNotificationEvent="false", CompletionBytes="0", ErrorCode="The operation completed successfully. (0x0)"
ISAPI_END
In the ISAPI Filters section in IIS Manager, there are four filters: a 32-bit and a 64-bit version for ASP.Net 2.0 and the same for ASP.Net 4.0, all called aspnet_filter.dll. I’m guessing these are standard filters – I know for certain, at least, that we haven’t mucked about with any ISAPI filters at all.
As should be obvious by now, I’m not really a server admin, and ISAPI filters are definitely above my level of knowledge.
So how do I proceed from here? How do I figure out why ISAPI is redirecting?
I am trying to use SAPUI5 in a SPA to display data from a TEIID/Wildfly ODataV4 service. When SAPUI5 ODATA V4 data model is bound to the service, I run into several errors. I thereby connect via proxy (grunt-connect-proxy2) to the odata service. Basic Auth works. The metadata file above the marked service folder in the attached image (screenshot1) is the actual metadata file of the service which, as you can see, is loaded correctly. So no CORS issue or authorization issue.
Screenshot1
The issue seems to be related to an CSRF Token request as far as I understand. Seems that Teiid/Wildfly is not answering the CSRF Token fetch request. Is there a way to configure Wildfly to answer the request or alternatively a way to disable CSRF requests for the odata V4 model? I have seen such an option in the constructor of the odata V2 model. How could a working configuration look like?
The following is a screenshot from the browser log:
I observed a further issue, from which I do not know if it is related to the previous one (there is also a X-CSRF-Token: Fetch involved), or if a have something more missing somewhere. The second issue happens when I use an aggregation binding to bind a odata collection to a sapui5 list. The response looks like
Request URL: http://localhost:9001/odata4/svc/my_nutri_diary/$batch
Request Method: POST Status Code: 406 Not Acceptable Remote Address:
[::1]:9001 Referrer Policy: no-referrer-when-downgrade Response
Headersview source access-control-allow-credentials: true
access-control-allow-origin: http://localhost:9001 cache-control:
no-cache, no-store, must-revalidate connection: close
content-encoding: gzip content-length: 125 content-type:
application/json;odata.metadata=minimal date: Mon, 12 Nov 2018
20:04:30 GMT expires: 0 odata-version: 4.0 pragma: no-cache server:
WildFly/11 x-powered-by: Undertow/1 Request Headersview source Accept:
multipart/mixed Accept-Encoding: gzip, deflate, br Accept-Language: de
Authorization: Basic SU1TVXNlcjpJTVM0Zm9ydW0l Connection: keep-alive
Content-Length: 329 Content-Type: multipart/mixed;
boundary=batch_id-1542053070786-11 Cookie: sidebar_collapsed=false;
cycle_analytics_help_dismissed=1;
__utmz=111872281.1539128843.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); __utma=111872281.767670437.1539128843.1541866362.1541870562.42 DNT: 1 Host: localhost:9001 MIME-Version: 1.0 OData-MaxVersion: 4.0
OData-Version: 4.0 Origin: http://localhost:9001 Referer:
http://localhost:9001/ User-Agent: Mozilla/5.0 (iPhone; CPU iPhone OS
11_0 like Mac OS X) AppleWebKit/604.1.38 (KHTML, like Gecko)
Version/11.0 Mobile/15A372 Safari/604.1 X-CSRF-Token: Fetch
X-Requested-With: XMLHttpRequest Request Payload
--batch_id-1542053070786-11 Content-Type:application/http Content-Transfer-Encoding:binary GET Profile?$skip=0&$top=100 HTTP/1.1
Accept:application/json;odata.metadata=minimal;IEEE754Compatible=true
Accept-Language:de
Content-Type:application/json;charset=UTF-8;IEEE754Compatible=true
--batch_id-1542053070786-11--
Thanks for your advice!
Best regards,
Christoph
Further note regarding search for a workaround: As I am currently searching for a workaround to be able to use the odata.v4 model, I found the following blog post:
https://blogs.sap.com/2015/08/05/disable-csrf-token-for-odata-calls-using-sap-netweaver-gateway/
However, the approach does not seem to work for the odata.v4 model as it has a different interface. There is no setHeaders() function to set custom headers on the datamodel. I therefore tried to set the header up via
$.ajaxSetup({headers: {'X-Requested-With': 'X'}});
Unfortunately, this also does not work. If someone has the odata.v4 Model running with TEIID or Olingo v4 it would be great if he could give me a feedback on how he had worked around this issue.
First time asking a question here. I'm a beginner at this, but i'm truly stumped at the problem i'm facing.
Browsers in use:
Safari and Firefox (both on Mac OS Sierra)
Firefox (Linux - Ubuntu 16.04.2)
I am registered as an Uber Developer and have registered an App in the Dashboard. I'm only using the Server Token for authentication at the moment. In the Dashboard, I have set the following entries in the "Authorizations" tab of the App for CORS (Optional URI for CORS Support):
http://localhost:8000 <-- web server in my PC
https://subdomain.mydomain.com <--- remote web server
A few months ago i created a web app using HTML, CSS and JS (with Jquery v2.2.4) to play around with the Ride Estimates API and was able to get it to report data for many locations in my area successfully. Somehow it no longer works. I'm trying to fix that and improve the functionality. However, i just can't get past the initial query to the API because of CORS issues that were not existent before.
My API URL is:
https://api.uber.com/v1/estimates/price?start_latitude=8.969145&start_longitude=-79.5177675&end_latitude=8.984104&end_longitude=-79.517467&server_token={*********SERVER*TOKEN**********}
When i paste that in the address bar of the browser i get valid JSON:
{"prices":[{"localized_display_name":"uberX","distance":1.58,"display_name":"uberX","product_id":"811c3224-5554-4d29-98ae-c4366882011f","high_estimate":3,"surge_multiplier":1.0,"minimum":2,"low_estimate":2,"duration":420,"estimate":"2-3\u00a0$","currency_code":"USD"},{"localized_display_name":"X English","distance":1.58,"display_name":"X English","product_id":"8fe2c122-a4f0-43cc-97e0-ca5ef8b57fbc","high_estimate":4,"surge_multiplier":1.0,"minimum":3,"low_estimate":3,"duration":420,"estimate":"3-4\u00a0$","currency_code":"USD"},{"localized_display_name":"uberXL","distance":1.58,"display_name":"uberXL","product_id":"eb454d82-dcef-4d56-97ca-04cb11844ff2","high_estimate":4,"surge_multiplier":1.0,"minimum":3,"low_estimate":3,"duration":420,"estimate":"3-4\u00a0$","currency_code":"USD"},{"localized_display_name":"Uber Black","distance":1.58,"display_name":"Uber Black","product_id":"ba49000c-3b04-4f54-8d50-f7ae0e20e867","high_estimate":6,"surge_multiplier":1.0,"minimum":4,"low_estimate":4,"duration":420,"estimate":"4-6\u00a0$","currency_code":"USD"},{"localized_display_name":"Uber SUV","distance":1.58,"display_name":"Uber SUV","product_id":"65aaf0c2-655a-437d-bf72-5d935cf95ec9","high_estimate":7,"surge_multiplier":1.0,"minimum":5,"low_estimate":5,"duration":420,"estimate":"5-7\u00a0$","currency_code":"USD"}]}
I then proceed to set up JS (w/ JQuery) code in webpage...
var url = "https://api.uber.com/v1/estimates/price?start_latitude=8.969145&start_longitude=-79.5177675&end_latitude=8.984104&end_longitude=-79.517467&server_token={*********SERVER*TOKEN**********}";
$.getJSON(url, function(result){
console.log(result);
});
Uploading the HTML and JS to my remote web server and then loading the webpage in any of my browsers yields a 200 status from Uber API. However, the console log shows CORS blocking my request (PROBLEM #1):
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://api.uber.com/v1/estimates/price?start_latitude=8.969145&start_longitude=-79.5177675&end_latitude=8.984104&end_longitude=-79.517467&server_token={*********SERVER*TOKEN**********}. (Reason: CORS header ‘Access-Control-Allow-Origin’ missing).
Then, in the Inspector view of both Mac Browsers, under the Network / Resources areas, i see the 200 Status message from the GET request. However, along with the Response message (PROBLEM #2):
SyntaxError: JSON.parse: unexpected end of data at line 1 column 1 of the JSON data
The Request Headers are:
GET /v1/estimates/price?start_latitude=8.969145&start_longitude=-79.5177675&end_latitude=8.984104&end_longitude=-79.517467&server_token={*********SERVER*TOKEN**********} HTTP/1.1
Host: api.uber.com
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Firefox/52.0
Accept: application/json, text/javascript, */*; q=0.01
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br
Referer: https://subdomain.domain.com/Uber/index.html
Origin: https://subdomain.domain.com
Connection: keep-alive
The Response Headers are:
HTTP/1.1 200 OK
Server: nginx
Date: Sun, 19 Mar 2017 22:26:31 GMT
Content-Type: application/json
Transfer-Encoding: chunked
Connection: keep-alive
Content-Geo-System: wgs-84
Content-Language: en
X-Rate-Limit-Limit: 2000
X-Rate-Limit-Remaining: 1998
X-Rate-Limit-Reset: 1489964400
X-Uber-App: uberex-nonsandbox, optimus, migrator-uberex-optimus
Strict-Transport-Security: max-age=604800
X-Content-Type-Options: nosniff
X-XSS-Protection: 1; mode=block
Content-Encoding: gzip
In Firefox for Linux i sometimes don't get the Syntax Error; i always seem to get it on the Mac Browsers. In Linux, when i do get that error, then clicking on the "Edit and Resend" Headers button (resending the Headers but without really editing the Headers), the Syntax Error disappears and the Response text actually shows the Uber API Object that is supposed to be there... but i still get the CORS Blocked message on the Console Log. I really don't understand why this is, but it seems contradictory. In the end, i am unable to get to use the API data that, using the same method months ago, i could get for several dozens of locations.
I have looked for answers in similar questions but so far have found none that apply to my case. Any help will be greatly appreciated. Getting really frustrated... really stuck here.
This issue was caused by the API not including the header correctly. This issue is resolved and the api is now working as expected. Also, the allow origin header will only be returned in a response if an origin is specified in the request.
Context and troubles
I'm currently building a web application on top of ezPlatform & Symfony.
My goal is now to request this app from an external website using a JS client (using the JS REST client of ezplatform : CAPI.js)
I tested my script localy (on the app itself = same domain) and everything is fine : I can GET and POST data.
But testing this script on an external webiste (CORS requests) didn't work. I am stuck with 2 differents problems :
Server side : The response headers do not contains the Access-Control-Allowed-Methods
Client side : No session cookies are given within a request
Details
Problem 1 : No header "allow_methods"
On chrome I always have this error :
XMLHttpRequest cannot load http://api.ezplatform.lan/api/ezp/v2/user/sessions. Response for preflight has invalid HTTP status code 405
Note that, on the server side, nelmio_cors bundle is used to configures the headers. The configs :
nelmio_cors:
paths:
'^/api/ezp/v2/':
max_age: 3600
allow_credentials: true
allow_origin: ['*']
allow_methods: ['POST', 'PUT', 'GET', 'DELETE', 'OPTIONS']
expose_headers: []
And now, here are the details of a failing preflight request :
GENERAL
Request URL:http://api.ezplatform.lan/api/ezp/v2/user/sessions
Request Method:OPTIONS
Status Code:405 Method Not Allowed
Remote Address:192.168.1.82:80
REPONSE HEADERS
Access-Control-Allow-Credentials:true
Access-Control-Allow-Headers:authorization, accept, content-type, x-csrf-token, destination, x-siteaccess
Access-Control-Allow-Origin:http://www.externalsite.lan
Access-Control-Max-Age:3600
Cache-Control:private
Connection:Keep-Alive
Content-Length:0
Content-Type:text/html; charset=UTF-8
Date:Tue, 13 Dec 2016 15:24:44 GMT
Keep-Alive:timeout=5, max=99
Server:Apache/2.4.23 (Ubuntu)
Vary:X-User-Hash
REQUEST HEADERS
Accept:*/*
Accept-Encoding:gzip, deflate, sdch
Accept-Language:fr-FR,fr;q=0.8,en-US;q=0.6,en;q=0.4
Access-Control-Request-Headers:content-type
Access-Control-Request-Method:POST
Cache-Control:no-cache
Connection:keep-alive
Host:api.ezplatform.lan
Origin:http://www.externalsite.lan
Pragma:no-cache
Referer:http://www.externalsite.lan/
User-Agent:Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36
In the "response headers", there is no Access-Control-Allow-Methods despite of the nelmio_cors configs.
Digging inside the nelmio_cors code I realized that the "allow_methods" config is retrieved but is then overwritten by something else, and here it becomes obscur to me.
This old ezpublish bug maybe give me a clue about the situation : the ezPublishRestBundle does not seems to find any "allowed method", and somehow overwrite the nelmio_cors config.
In the Resprovider.php file, if I force the methods getAllowedMethods to return this :
return ["POST", "PUT", "GET", "DELETE", "OPTIONS"]; then I have no more 405 error but a very different problem (explained right after this)
Problem 2 : no session cookies allowed
With my previous wonderful hack, I can now get a little bit further : my request are allowed but some of them are still failing.
I noticed that no session cookie is passed inside the requests (which is the normal behaviour testing on the same domain).
This times it seems to come from the CAPI.js file : the XmlHttpRequest object never has the property withCredentials to true.
If I add this code XHR.withCredentials = true; in CAPI.js before the request is send, then it seems to be fine.
Conclusion
I really wonder if the ez Platform rest client has been designed to be used for cross domain, but it would be very surprising if not.
So I must do something wrong, and if someone can explain me what, I would be extemely grateful :)
I am new to REST so bear with me if I'm missing something obvious.
Any pointer would be much appreciated as I am a bit lost.
Scenario
I needed to post some data to the following REST service: https://api.dotmailer.com/ from my web application https://myapp.com/.
During testing, I was able to post the data from my local pc.
However, as soon as I published the updated application to https://myapp.com/ on a remote server, I was no longer able to post any data.
What I've tried so far
Added rule to the remote server firewall to allow outgoing traffic to use https. Didn't solve the problem.
Disabled the url rewriting rule that change http to https for myapp.com. Didn't solve the problem.
Pasted the URL I use to post my data (https://api.dotmailer.com/v2/address-books/12345/contacts) in a browser on the remote server, entered the correct credentials, but couldn't access it.
the error message said "Unable to open this internet site. The requested site is either unavailable or cannot be found." If I do the same on my local PC I can access the URL.
Monitored the two calls with Fiddler2.
I include the results of the monitoring process below:
CALLS MADE FROM REMOTE SERVER
----------
POST /bla.aspx HTTP/1.1
Host: myapp.com
Connection: keep-alive
Content-Length: 10660
Cache-Control: max-age=0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Origin: https://myapp.com
User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.153 Safari/537.36
Content-Type: application/x-www-form-urlencoded
DNT: 1
Referer: https://myapp.com/bla.aspx
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8,it;q=0.6
Cookie: ASP.NET_SessionId=xxx; Myapp=xxx; GUID=xxx
CALLS MADE FROM LOCAL PC
----------
POST /bla.aspx HTTP/1.1
Host: localhost:xxx
Connection: keep-alive
Content-Length: 10656
Cache-Control: max-age=0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Origin: http://localhost:60675
User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.153 Safari/537.36
Content-Type: application/x-www-form-urlencoded
DNT: 1
Referer: http://localhost:xxx/bla.aspx
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8,it;q=0.6
Cookie: __eqtUser=xxx; ASP.NET_SessionId=xxx; Myapp=xxx; GUID=xxx
Question
I believe point 3 shows that the cause is some setting on the remote server.
Does anyone know what it could be? Or am I completely off-track?
Update
I spoke with the developer on the receiving end of my calls who can monitor incoming traffic.
He could see my local calls but not the ones submitted from https://myapp.com.
In response to gmlime reply, I've added the following to myapp.com web.config file but didn't help.
<system.webServer>
<httpProtocol>
<customHeaders>
<add name="Access-Control-Allow-Origin" value="*" />
</customHeaders>
</httpProtocol>
</system.webServer>
Should I put it at a higher level in the hierarchy?
Make sure that this gets added to the response:
YourAddHeaderMethod("Access-Control-Allow-Origin", "*");
Many servers deny posting from other domains and can terminate the connection. You can learn more about it from the w3 docs for Access-Conrol-Allow-Origin and Mozzilla covers some scenarios. You may have to check with the server administrator to rule out cross domain problems also.