Android Volley Post Request Header not changing
-
21-12-2019 - |
Question
I am using Android Volley
library to send POST
request. And for POST
request
- Header is
Content-Type:application/json
- Post Body is
Json String
But whatever,I do to change the Volley Request Header
,it is always set to Content-Type:text/html
. And this gives me 400 Bad Request
. Here is my class for do POST
request on Volley
public class GsonRequest<T> extends Request<T> {
private final Class<T> clazz;
private final Map<String, String> headers;
private final Listener<T> listener;
private Map<String, String> postParams;
private String postString = null;
/**
* Make a GET request and return a parsed object from JSON.
*
* @param url
* URL of the request to make
* @param clazz
* Relevant class object, for Gson's reflection
* @param headers
* Map of request headers
*/
public GsonRequest(int method, String url, Class<T> clazz,
Map<String, String> headers, Map<String, Object> params,
Listener<T> listener, ErrorListener errorListener) {
super(method, url, errorListener);
this.clazz = clazz;
this.headers = headers;
this.listener = listener;
if (method == Method.POST && params != null && params.size() > 0) {
setRetryPolicy(new DefaultRetryPolicy(12000, 0,
DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
postString = new GsonBuilder().create().toJson(params);
}
}
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
return headers != null ? headers : super.getHeaders();
}
@Override
public byte[] getBody() throws AuthFailureError {
return postString != null ? postString.getBytes(Charset
.forName("UTF-8")) : super.getBody();
}
@Override
public String getBodyContentType() {
return postString !=null?"application/json; charset=utf-8":super.getBodyContentType();
}
@Override
protected void deliverResponse(T response) {
listener.onResponse(response);
}
@Override
protected Response<T> parseNetworkResponse(NetworkResponse response) {
try {
String json = new String(response.data,
HttpHeaderParser.parseCharset(response.headers));
Log.i("response", json);
T responses = new GsonBuilder().create().fromJson(json, clazz);
return Response.success(responses,
HttpHeaderParser.parseCacheHeaders(response));
} catch (UnsupportedEncodingException e) {
return Response.error(new ParseError(e));
} catch (JsonSyntaxException e) {
return Response.error(new ParseError(e));
} catch (Exception e) {
return Response.error(new ParseError(e));
}
}
}
Any idea what I am doing wrong.I have tested with normal HttpPost
and it is working from there, but while using Volley
,my POST Header
is never changed.
La solution 2
Using network sniffing tool like Wireshark
,I found that my error lay on wrong HTTP header
. Then using Chrome DHC plugin
I found that Header Content-Type
should be application/json; charset=utf-8
and I was continuously using
Map<String, String> header = new HashMap<String, String>();
header.put("Content-Type", "application/json");
instead of
Map<String, String> header = new HashMap<String, String>();
header.put("Content-Type", "application/json; charset=utf-8");
Using proper Header
solved my issue
Autres conseils
I found I had to override getBodyContentType()
in order to get the Content-Type
header to update correctly:
public String getBodyContentType()
{
return "application/json; charset=utf-8";
}
Here is my question with some more details on this issue: