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Error 404 with Java HttpClient

I am using Java HttpClient package to make http requests. But I am getting 404. When I try the same request with curl, it works fine. Here's the curl request -
curl -i -X POST http://api/endpoint -H "Content-Type: application/json" -d 'content'
Here's the java code that I am using to implement the above curl request -
HttpClient client = HttpClientBuilder.create().build();
HttpPost post = new HttpPost("http://api/endpoint");
post.setHeader("Content-type", "application/json");
post.setEntity(new StringEntity(content));
HttpResponse response = client.execute(post);
logger.info("Response Code : "
+ response.getStatusLine().getStatusCode());
BufferedReader rd = new BufferedReader(
new InputStreamReader(response.getEntity().getContent()));
StringBuffer result = new StringBuffer();
String line = "";
while ((line = rd.readLine()) != null) {
result.append(line);
}
logger.info("Response details "+result);
I see error 404 NOT FOUND when I run this java code. What could the problem be?

Remove post.setHeader("Accept", "application/json");

Why am I getting HTTP 400 bad request

I am using an HTTP client (code copied from http://www.mkyong.com/java/apache-httpclient-examples/) to send post requests. I have been trying to use it with http://postcodes.io to look up a bulk of postcodes but failed. According to http://postcodes.io I should send a post request to http://api.postcodes.io/postcodes in the following JSON form: {"postcodes" : ["OX49 5NU", "M32 0JG", "NE30 1DP"]} but I am always getting HTTP Response Code 400.
I have included my code below. Please tell me what am I doing wrong?
Thanks
private void sendPost() throws Exception {
String url = "http://api.postcodes.io/postcodes";
HttpClient client = HttpClientBuilder.create().build();
HttpPost post = new HttpPost(url);
List<NameValuePair> urlParameters = new ArrayList<NameValuePair>();
urlParameters.add(new BasicNameValuePair("postcodes", "[\"OX49 5NU\", \"M32 0JG\", \"NE30 1DP\"]"));
post.setEntity(new UrlEncodedFormEntity(urlParameters));
HttpResponse response = client.execute(post);
System.out.println("Response Code : "
+ response.getStatusLine().getStatusCode());
System.out.println("Reason : "
+ response.getStatusLine().getReasonPhrase());
BufferedReader br = new BufferedReader(
new InputStreamReader(response.getEntity().getContent()));
StringBuffer result = new StringBuffer();
String line = "";
while ((line = br.readLine()) != null) {
result.append(line);
}
br.close();
System.out.println(result.toString());
}

This works, HTTP.UTF_8 is deprecated:
String url = "http://api.postcodes.io/postcodes";
HttpClient client = HttpClientBuilder.create().build();
HttpPost post = new HttpPost(url);
StringEntity params =new StringEntity("{\"postcodes\" : [\"OX49 5NU\", \"M32 0JG\", \"NE30 1DP\"]}");
post.addHeader("Content-Type", "application/json");
post.setEntity(params);

Jon Skeet is right (as usual, I might add), you are basically sending a form and it defaults to form-url-encoding.
You could try something like this instead:
String jsonString = "{\"postcodes\" : [\"OX49 5NU\", \"M32 0JG\", \"NE30 1DP\"]}";
StringEntity entity = new StringEntity(jsonObj.toString(), HTTP.UTF_8);
entity.setContentType("application/json");
post.setEntity(entity);

how to set parameters to server from android application?

I have the following code to connect from my android application to zappos api server and search for some stuff. But It either returns error 404 or We are unable to process the request from the input feilds given.
When I execute the same query it works on the web browser.
The query is:
http://api.zappos.com/Search&term=boots&key=<my_key_inserted_here>
Code:
HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost("http://api.zappos.com/Search");
NameValuePair keypair = new BasicNameValuePair("key",KEY);
NameValuePair termpair = new BasicNameValuePair("term",data);
List<NameValuePair> params = new ArrayList<NameValuePair>(2);
params.add(keypair);
params.add(termpair);
post.setEntity(new UrlEncodedFormEntity(params));
HttpResponse response = client.execute(post);
String str;
StringBuilder sb = new StringBuilder();
HttpEntity entity =response.getEntity();
if (entity != null) {
DataInputStream in = new DataInputStream(entity.getContent());
while (( str = in.readLine()) != null){
sb.append(str);
}
in.close();
}
Log.i("serverInterface","response from server is :"+sb.toString());
What am I doing wrong?

If I am correct, what you want to do is a GET request with parameters.
Then,the code would looks like something like that:
HttpClient client = new DefaultHttpClient();
HttpGet get = new HttpGet("http://api.zappos.com/Search");
HttpParams params = new BasicHttpParams();
params.setParameter("key", "KEY");
params.setParameter("term", "data");
get.setParams(params);
HttpResponse response;
response = client.execute(get);
String str;
StringBuilder sb = new StringBuilder();
HttpEntity entity = response.getEntity();
if (entity != null) {
DataInputStream in;
in = new DataInputStream(entity.getContent());
while ((str = in.readLine()) != null) {
sb.append(str);
}
in.close();
}
Log.i("serverInterface", "response from server is :" + sb.toString());

I found an answer to the question based on ALL of your help. I got the hint that I must search how to connect to REST service and I also used this result. This is the exact result I was looking for. Sadly it resembles too much to what I'm trying to achieve that I think whoever asked it might be applying to the same position :(

Cleartrip Flight API - "Not authorized to access the service" error

I am using Cleartrip Flight API to get flight fare details. When request the URL with API key, i am getting "Not authorized to access the service" error. Here is my Java code using Apache HttpComponents
HttpHost proxy = new HttpHost("My IP", Port No, "http");
String url = "https://api.cleartrip.com/air/1.0/search?from=BOM&to=DEL&depart-date=2013-06-06&return-date=2013-06-06";
//String url = "http://www.google.com/search?q=developer";
HttpClient client = new DefaultHttpClient();
client.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY, proxy);
HttpGet request = new HttpGet(url);
// add request header
request.addHeader("X-CT-API-KEY", "My API Key");
request.addHeader("User-Agent", "Mozilla/5.0");
System.out.println(" header "+request.getHeaders("X-CT-API-KEY")[0]);
HttpResponse response = client.execute(request);
System.out.println("\nSending 'GET' request to URL : " + url);
System.out.println("Response Code : " +
response.getStatusLine().getStatusCode());
BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
StringBuffer result = new StringBuffer();
String line = "";
while ((line = rd.readLine()) != null) {
result.append(line);
}
System.out.println(result.toString());
}
Can anyone help me !!!

Even i had the same issue. Later i came to know that all the api (which you get during singn up process) are blocked by default. You have to write a mail to api.support#cleartrip.com
They will ask your company details, business model and business case. If they are satisfied with those details then they will unblock your api key.
Since my project is for my final semester they have rejected my api key query.
Here i am sharing my java code. So that it might be useful for some one.
HttpClient client = new DefaultHttpClient();
String getURL =URL;
Log.d("URL",getURL);
HttpGet get = new HttpGet(getURL);
get.setHeader("X-CT-API-KEY", (my api key));
HttpResponse responseGet = client.execute(get);
HttpEntity resEntityGet = responseGet.getEntity();
if (resEntityGet != null)
{
Log.i("GET ", EntityUtils.toString(resEntityGet));
}
Since i was not authorized to use this api i got the following response.
<?xml version="1.0" encoding="UTF-8" standalone="yes"?><faults xmlns="http://www.cleartrip.com/apigateway/common"><fault><fault-message>Not authorized to access the service</fault-message></fault></faults>
HTTP URL is as follows
https://api.cleartrip.com/air/1.0/search?from=BOM&to=DEL&depart-date=2013-11-11&return-date=2013-12-12

httpclient response

I am trying to autologin into a webpage. Im asssuming that i pass the proper credentials.
entity.getContentLength() shows 20 but the repsonse i see is not well formatted. It is not an HTML. How should i proceed further. Below is my code.
String input_text = "https://www.abc.com";
HttpPost httpost = new HttpPost(input_text);
List <NameValuePair> nvps = new ArrayList <NameValuePair>();
nvps.add(new BasicNameValuePair("email", "abc#xyz.com"));
nvps.add(new BasicNameValuePair("passsword", "ttyyeri"));
nvps.add(new BasicNameValuePair("publicLoginToken",""));
httpost.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8));
HttpResponse response = httpclient.execute(httpost);
entity = response.getEntity();
if (entity != null) {
BufferedReader br = new BufferedReader(new InputStreamReader(entity.getContent()));
String readLine;
while(((readLine = br.readLine()) != null)) {
System.err.println("br :"+readLine);
}
System.out.println("Response content length: " + entity.getContentLength());
}
System.out.println("HTML Content :::"+entity.getContent().toString());

try
StatusLine l = response.getStatusLine();
System.out.println(l.getStatusCode() + " " + l .getReasonPhrase());
output ?

Sounds like you are getting an authorization request redirect. This may have already been covered here: Http Basic Authentication in Java using HttpClient?

Investigate the HttpResponse Header, you can find the content type and the response code.
Which will help you to find the problem.