javascript - PDF in iframe showing title as 'Anonymous' -


i using angular2. getting pdf response blob backend api. pdf showing fine in iframe showing title 'anonymous'. can please guide?

html code:

<iframe id="showpdfiframe" allowtransparency="false" title="testpdf" width="100%" height="800" [attr.src]="datalocalurl" type="application/pdf"></iframe>

pdf.component.ts

    pdfdownload: any;     protected datalocalurl: saferesourceurl;      ngoninit() {     this.requestoptions = this.createrequestoptions();     this.requestoptions.responsetype = responsecontenttype.blob;     this._pdfmodelservice.showpdf(this.requestoptions)     .subscribe( (res) => {       this.pdfdownload = res;       this.datalocalurl = this.domsanitizer.bypasssecuritytrustresourceurl(window.url.createobjecturl(res));     }, err => {       console.log(err);     })    }

pdfmodelservice.ts

showpdf(options?: requestoptions): {     return this._http.get(this.endpoints.showpdf.uri, options)       .map( (res) => {         return new blob([res], { type: 'application/pdf' })       });   }

see below image 'anonymous' showing enter image description here

note: backend api gives bytes cast in blob.

have tried providing title in options: 

showpdf(options?: requestoptions): { return this._http.get(this.endpoints.showpdf.uri, options)   .map( (res) => {     return new blob([res], { type: 'application/pdf', title: 'testpdf' })   }); }

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