Converting working Ajax call to Angular Observable - ajax

Question

I have an existing JavaScript application that submits documents (.pdf, .txt...) to Solr for text extraction. I am now trying to convert that capability to an Angular-6 implementation and am struggling with the whole observable pattern. Below is the working js code, followed by my angular component and service .ts files. I think I'm close, but no cigar.
let myReader = new FileReader();
myReader.onloadend = function() {
fileAsBlob = myReader.result;
sendToSolr(fileAsBlob);
};
fileAsBlob = myReader.readAsArrayBuffer(file);
/* Get the unique Id for the doc and append to the extract url*/
let docId = $("#post_docId").val();
let extractUrl = "http://localhost:8983/solr/" + core + "/update/extract/?commit=true&literal.id=" + docId;
/* Ajax call to Solr/Tika to extract text from pdf and index it */
function sendToSolr(fileAsBlob) {
$.ajax({
url: extractUrl,
type: 'POST',
data: fileAsBlob,
cache: false,
jsonp: 'json.wrf',
processData: false,
contentType: false,
echoParams: "all",
success: function(data, status) {
//console.log("Ajax.post successful, status: " + data.responseHeader.status + "\t status text: " + status);
//console.log("debug");
getDocument(docId);
},
error: function(data, status) {
//console.log("Ajax.post error, status: " + data.status + "\t status text:" + data.statusText);
},
done: function(data, status) {
//console.log("Ajax.post Done");
},
});
}
All the above does is use a fileReader to read a local file into an ArrayBuffer, and submits that ArrayBuffer to Solr via an Ajax call. In my success I do call another function (getDocument) which just queries Solr (By docId) for the document I just submitted and displays it. Not beautiful, but it works.
For the angular version I have the following service:
constructor(private http: HttpClient) { }
postDocToSolr(fileAsBlob: any): Observable<any> {
let httpHeaders = new HttpHeaders()
.set('type' , 'POST')
.set('jsonp', 'json.wrf')
.set('processData', 'false')
.set('echoParams', 'all')
.set('Content-Type', 'application/x-www-form-urlencoded')
.set('charset', 'utf-8')
.set('data', fileAsBlob);
let options = {
headers: httpHeaders
};
return this.http.post(this.extractUrl, fileAsBlob, options);
}
}
I tried posting the entire service, but it threw the formatting off so here is the POST part of the service.
And in my component I call the service:
extractText(fileContents: any) {
console.log("In the Document.extractText() method");
//this.processDocument(fileContents);
this.textExtractor.postDocToSolr(fileContents)
.subscribe(data => {
console.log("Debug");
console.log("Data: ") + data;
},
error => {
console.log("Error" + error);
}
);
console.log("Debug");
}
Note I've done the fileReader already and am submitting basically the same ArrayBuffer.
The only hint is the in the error => log the error callback(Right term?)on the observable. I get an error code 400, bad request with the message:
"msg":"URLDecoder: Invalid digit (P) in escape (%) pattern"
Which doen't help me much. I'm wondering if it's an encoding issue (UTF-8) but not sure where to begin. Would appreciate a nudge in the right direction.

Answer 1

It looks like the problem is how angular is encoding your URI, I would open your network tool of choice (network tab, fiddler, etc) and look at the sent request URI of each. I suspect they'll be different.

Answer 2

Well, it's often the small things that trip me up. I needed to set the Content-Type to "false" and everything works fine. I also re-did the creation of the httpHeaders, but I think either way would have worked. The working postToSolr Service method is:
export class TextExtractorServiceService {
extractUrl: string = "http://localhost:8983/solr/tater/update/extract/?commit=true&literal.id=778";
constructor(private http: HttpClient) { }
postDocToSolr(fileAsBlob: any): Observable<any> {
const httpOptions = {
headers: new HttpHeaders({
"jsonp": "json.wrf",
"processData": "false",
"echoParams" : "all",
"Content-Type": "false",
"cache": "false"
})
};
return this.http.post(this.extractUrl, fileAsBlob, httpOptions);
}
}
Thanks to all who took a look.